Display Tags

Hello,

I was wondering if there is a solution to display tags in the text creation of the ads.
Example.

I have two main category and for each categories I would like to display tags
–> A (category)
–> 1 (tags)
–> 2

–> B
–> 3
–> 4

If my client choose category A the next step for them will be to choose tags 1 ; 2
If my client choose category B the next step for theme will be to choose tags 3 ; 4