Adds a button to the WC edit/new product page that enables generating a SKU (catalog number) in a pre-defined format and length.

Noted That:

To install correctly this atr-random-sku-for-woocommerce.zip.
Fisrt Download the atr-random-sku-for-woocommerce.zip to your computer
Extract/Open atr-random-sku-for-woocommerce.zip to Your Computer.
Then, Find readme.txt file inside atr-random-sku-for-woocommerce.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "atr-random-sku-for-woocommerce.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "atr-random-sku-for-woocommerce.zip" Downloaded plugin from your computer, Where you downloaded atr-random-sku-for-woocommerce.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "SKU generator for Woocommerce by ATR" folder is added on left sidemenu. Now, Click on "SKU generator for Woocommerce by ATR" folder.

Noted that: If you do not see "SKU generator for Woocommerce by ATR" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about SKU generator for Woocommerce by ATR Configurtions and Settings or How to work "SKU generator for Woocommerce by ATR" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "SKU generator for Woocommerce by ATR" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is SKU generator for Woocommerce by ATR
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Installing “ATR structured SKU generator for Woocommerce” can be done either by searching for “ATR structured SKU generator for Woocommerce” via the “Plugins > Add New” screen in your WordPress dashboard, or by using the following steps: Upload the plugin files to the ‘/wp-content/plugins/atr-random-SKU-for-woocommerce’ directory, or install the plugin through the WordPress plugins screen directly. Activate the plugin through the ‘Plugins’ screen in WordPress Important! You must go to plugin settings page and select the options apply to your shop. Settings Use the Settings->ATR rand sku Woo screen to configure the plugin Select the format you require for the SKU: “Use max min” or “Use string” or “Use Incremental” “Use max min” – you want the SKU to contain only numbers between the specified numbers. “Use string” – you want the SKU to contain only characters you specified. “Use Incremental” – You want to increment the SKU by 1 for next product edited/created. Set the relevant options for your selection. If you want the plugin to auto fill new products SKU for you select the option “Check this to fill auto SKU when field is empty (also for new products)” You can set a prefix that will be added to every newly generated SKU. The plugin options allows you to select between numeric, alpha numeric or incremented SKU. The random SKU format will be generated according to these selections. Numeric string – “Use max min” If you select a numeric string, you should set a minimum and maximum numbers. Setting the min/max numbers will force the random SKU generated to hold only numbers between those numbers. That way you can also define how many digits will be in the SKU. For example, if you select min: 10000 and max: 99999 you’ll get SKU’s with 5 digits long between these two numbers. Characters strings – “Use string” If you select a characters string, you’ll have to define 1. The characters to be used in the string 2. The length of the string For example, if you select “abcdefghijklmnopqrstuvwxyz123456789” for the characters and “8” for the length, the SKU string will be 8 characters long and with all the letters and numbers except 0 (zero) and capital letters. Incremental Start increment from number – Define the start number. Default is 1. The index always incremented up as long as the “Incremental” option is selected. If you want to skip forward or backward some numbers you can change the “Start at” option to the number you want.

Guide

Installing “ATR structured SKU generator for Woocommerce” can be done either by searching for “ATR structured SKU generator for Woocommerce” via the “Plugins > Add New” screen in your WordPress dashboard,
or by using the following steps:

Upload the plugin files to the ‘/wp-content/plugins/atr-random-SKU-for-woocommerce’ directory, or install the plugin through the WordPress plugins screen directly.
Activate the plugin through the ‘Plugins’ screen in WordPress

Important! You must go to plugin settings page and select the options apply to your shop.

Settings

Use the Settings->ATR rand sku Woo screen to configure the plugin
Select the format you require for the SKU: “Use max min” or “Use string” or “Use Incremental”
“Use max min” – you want the SKU to contain only numbers between the specified numbers.
“Use string” – you want the SKU to contain only characters you specified.
“Use Incremental” – You want to increment the SKU by 1 for next product edited/created.
Set the relevant options for your selection.
If you want the plugin to auto fill new products SKU for you select the option “Check this to fill auto SKU when field is empty (also for new products)”
You can set a prefix that will be added to every newly generated SKU.

The plugin options allows you to select between numeric, alpha numeric or incremented SKU.
The random SKU format will be generated according to these selections.

Numeric string – “Use max min”

If you select a numeric string, you should set a minimum and maximum numbers.
Setting the min/max numbers will force the random SKU generated to hold only numbers between those numbers.
That way you can also define how many digits will be in the SKU.
For example, if you select min: 10000 and max: 99999 you’ll get SKU’s with 5 digits long between these two numbers.

Characters strings – “Use string”

If you select a characters string, you’ll have to define
1. The characters to be used in the string
2. The length of the string
For example, if you select “abcdefghijklmnopqrstuvwxyz123456789” for the characters and “8” for the length, the SKU string will be 8 characters long and with all the letters and numbers except 0 (zero) and capital letters.

Incremental

Start increment from number – Define the start number. Default is 1.
The index always incremented up as long as the “Incremental” option is selected.
If you want to skip forward or backward some numbers you can change the “Start at” option to the number you want.

number, catalog, defined, format, length, generating, enables, button, editnew, product,

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Reffered: https://wordpress.org/