I was trying to set a number of uses of a spell based on proficiency bonus. I saw that under spells you can say number of uses, and number of uses = ability score mod of your choice. 

But you cant set it based on prof bonus. So I googled it and found this

https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/45906-uses-equal-to-proficiency-bonus

But as far as I can tell MellieDM's response is no longer valid. 

When you go to "add action" the description reads: 

"Input any information related to this action that's granted by this feature. If it requires the character to be a certain level, choose a level. If the action has limited use information associated with it, specify a reset type and the number of uses. If the Action has more than one use per reset, specify a Number of Uses greater than one. You are also able to specify more detailed limited usage information below, specifically whether to use an ability score modifier to determine uses as well as number of uses at specific levels."

However, none of the options under any action type have anything to do with "uses" 

Send help. 

Two things:

uses to cast a spell and uses for an action are not the same thing and not interactive. They have not finished programming Spell uses buy Proficiency Bonus.

To add limited uses to an action, you first must designate the reset type, and save it. After that, you can go back and add the number of uses afterwards.

Do I need to create a seperate class feature at each of those levels?

If so, wont that prevent me from sharing it?

Yes.

Yes.

Ignore that, I thought I was answering something else lol 

No. Wait a minute, what exactly are you attempting to do? If you are attempting to let them cast that spell a number of times per Long Rest equal to their Proficiency modifier, then that is currently not possible mechanically because DDB hasn’t added Proficiency bonus as a metric for setting number of uses for a spell yet. (Yet. It’s the same problem preventing the Circle of Stars Druid’s Star Map from displaying the correct Number of Uses for Guiding Bolt.*)

* (https://www.dndbeyond.com/forums/d-d-beyond-general/bugs-support/87774-tashas-cauldron-of-everything-issues-and-support?comment=1)

DRUID

• Circle of Stars - Star Map. This should grant a number of uses equal to your proficiency bonus. We don't currently have the facility to implement this within our tools. This is on the list for development.

There’s not even a good way to fake it other than creating a new feature at each level PB increases. That’s still not quite right as it gets thrown off if they Multiclass.

However, if they add that as part of the gimongous system features update they’re doing then it should be available soon.

Hi I have a similar but slightly different problem. I need to put spell uses equal to an ability modifier for a bard subclass

Ex: If you have a +3 to charisma, you get 3 spell uses

How do I input that?

That depends on what exactly you mean. Can they be used for any spells, or just a specific spell?

Just one specific spell, I see the "uses" thingy but don't know how to input that

Quote from Nercomancia >>

Just one specific spell, I see the "uses" thingy but don't know how to input that

 
For what you want you would fill it out like this:

I didn’t know which spell, so I left that field blank but still highlighted it for you. I am assuming that the character would also use Cha as the spell casting ability, which is what A is for. If this were for a feat instead of a subclass (or race), then you would skip B, C & D.