Create your own fields for your posts / pages and propose a search based on these fields to your visitors.

Noted That:

To install correctly this search-for-custom-fields.zip.
Fisrt Download the search-for-custom-fields.zip to your computer
Extract/Open search-for-custom-fields.zip to Your Computer.
Then, Find readme.txt file inside search-for-custom-fields.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 "search-for-custom-fields.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 "search-for-custom-fields.zip" Downloaded plugin from your computer, Where you downloaded search-for-custom-fields.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Search For Custom Fields" folder is added on left sidemenu. Now, Click on "Search For Custom Fields" folder.

Noted that: If you do not see "Search For Custom Fields" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Search For Custom Fields Configurtions and Settings or How to work "Search For Custom Fields" 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 "Search For Custom Fields" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Search For Custom Fields
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
To install the plugin: – Unpack the ZIP file, – Place the decompressed folder in the wp-content / plugins / folder of your site, – In the administration of your site, go to “Extensions” then click on “Activate” for the plugin “Search For Custom Fields”, – A new “Search For Custom Fields” menu will appear.

Guide

To install the plugin:

– Unpack the ZIP file,
– Place the decompressed folder in the wp-content / plugins / folder of your site,
– In the administration of your site, go to “Extensions” then click on “Activate” for the plugin “Search For Custom Fields”,
– A new “Search For Custom Fields” menu will appear.

your, fields, based, these, visitors, search, pages, posts, create, propose,

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Reffered: https://wordpress.org/