Hello just as the title says simply trying to do this on my homebrew armor and I can't find anyway to. I would like to award special pieces of armor that don't require proficiency. 

trying to figure this out also

Armor doesn't require proficiency except to cast spells. To create a piece of armor that allows its wearer to cast spells without proficiency has pretty big implications. Regardless, it's not possible to code it in using D&D Beyond's homebrew tool. You'll have to just pretend.

You would use the following modifier to have that specific armor automatically grant proficiency in itself to the wearer:

Modifier: Proficiency->Subtype: Self

I found a way around it, and that is to go proficiency and then set it to the type of armour (eg:plate), so that if you don’t have proficiency with heavy armour at least that piece gives the pc temporary proficiency while they wear it

Quote from Pakkasparkers >>

I found a way around it, and that is to go proficiency and then set it to the type of armour (eg:plate), so that if you don’t have proficiency with heavy armour at least that piece gives the pc temporary proficiency while they wear it

 
With the “Proficiency->Self” that I suggested it does the same thing, but instead of temporarily giving proficiency in all armor of that type whe they w at it it only gives proficiency in itself while they wear it.

I might do that then, thanks :)