Add Custom Fields in Specific categories REVEALED !
Secret Revealed ! Here's the solution :.
Step One go to Dashboard and choose custom fields , Creat All your fields like Model , year , Version , Color etc .
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Step Two : go to form layout its right above custom fields , then create new form : Fill your needs according to the form you want to create
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Step Three Link your fields with the form you just created : Go back to form Layouts then click in the end of the tab "Edit form layout" then you should see something like this.
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Then simply add your feilds to your form so it will appear for each user will choose to post in cars or phones or what ever category you choose
Good luck !! hope that was Helpful