Sorry if this is answered somewhere before but I can't seem to find the right keywords in my searches to solve my issue.

I'm currently developing a Race requested by one of my players and one of the Racial Traits should allow the player to choose proficiency either between Athletics or Acrobatics. However when going to set that up under the modifiers tab, I can only seem to add a single skill which would give the player proficiency in both, rather than choosing. How would I go about setting this up in my Racial Trait? Ideally I would also like the selected Skill to be giving advantage once per short rest but that's not as important currently.

Thanks for any help :)

Edit: I've found this page on Code Snippits but it doesn't seem to include anything about Skill specifically unless I'm just completely blind.

Snippets don’t actually “do” anything, they just display calculated results.

To do what you want, you will have to set up an array of Options, each one granting a different skill. There is a full walkthrough on how to properly set up Options in the Subclasses & Species FAQ #1: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq).