how to create custom CPT in wordpress like project and in project i want to create inventory CPT
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best plugin for CPT UI
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How to Create Custom Post Types in WordPress
Beginner's guide to custom post types in WordPress. Learn how to create custom post types in WordPress.

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Registering Custom Post Types – Plugin Handbook | Developer.WordPress.org
WordPress comes with five default post types: post, page, attachment, revision, and menu. While developing your plugin, you may need to…
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Custom Post Type UI
Admin UI for creating custom content types like post types and taxonomies