I am trying to code a class feature that replicates the Psi Warriors, Psionic Energy dice, but not in a fighter subclass. I was able to get it to visually appear correctly but not able to mark off any of the uses. I have it coded the same from what I can tell. Please advise

Set up a 3rd-level feature named “Psionic Power,” and then attach a “General” action to that feature- Name: “Psionic Power: Psionic Energy;” Activation Type: Special (since it triggers whenever the PC uses an eligible feature); Reset Type: Short Rest; [SAVE]. DDB didn’t actually add the die to this action, however you could if you want to. The likely felt it unnecessary since they needed to add the die to the Psionic Strike action which is also attached to the same Psionic Power feature (as are the Telekinetic Movement and Protective Field actions).  After you save, go back and edit the action to [ADD LIMITED USE DATA]- Number of Uses: 2; Use Proficiency Bonus: ☑️; Proficiency Bonus Operator: x (Multiplication); [SAVE] the Limited Use Data, [SAVE] the Action, [SAVE CHANGES] for the feature, [SAVE CHANGES] for the whole subclass.

For the scaling Psionic Energy Die, whichever action(s) you choose to attach it to, it’s super easy- Dice Count: 1; Die Size: d6; [SAVE]. Then edit that action to [ADD A LEVEL OVERRIDE] (actually you’ll have to add three)- Level: 5; Die Size: d8; [SAVE]. (The other two would be 11 & d10, and 17 & d12, just like in the UA version.) Again, as always, [SAVE] the Action, [SAVE CHANGES] for the feature, [SAVE CHANGES] for the whole subclass.

Once you have saved the entire subclass for what you think is the final time, give the system 20 minutes before checking things on a character sheet.

I hope that helps.

Bonus Notes:

• Don’t bother copying the class feature description into all of the actions, it’s unnecessary. Just do the snippets so they display on the character sheet, if there is no description attached to an action the sidebar will automatically display the description from the main feature itself.
• Whenever you copy/paste from anywhere into the homebrewer, past it into a snippet field first to scrub any potential errant formatting, then copy that and paste it into the description field.

Ok, if its for a wizard subclass, how would I transpose that? Since the features are gained at different levels and the ability name would be different.

Just make this a 2nd-level feature instead of a 3rd-level one and make it whatever you like. 

I wouldn’t change those levels though. Those 5th, 11th, & 17th are the same levels at which cantrips increase in power. That’s why they were chosen. So I wouldn’t recommend changing those. And the levels at which they would get their other features is equally irrelevant to how this functions. Those are separate, independent features. 

Oh it's only scaling once at 14th level because it is still a wizard at the end of the day. I had made it a 2nd level ability to go with the choosing of the subclass. I got it to appear on the character sheet and coded the abilities but it doesn't let me like show that I've used the dice.

Yes, it would get new “psionic” abilities at 6th, 10th, and 14th, but the die side would still increase at 5Th, 11th, and 17th. The two don’t have to coincide. (They don’t for the Psi Warrior or Soulknife either.) Reread what I wrote and replicate it and you will get the checkboxes that can get checked off to indicate it was used. That’s what the limited use data is for. Replicate what I said exactly, only make it a 2nd level feature instead of a 3rd level feature.

Thank you for all your help! I learned a lot 😁

As usual, happy to help.