Yep, you get Tren base and attach an ester to it.

i bought 10g of Tren eth powder i wanna know how to make it like how much BA how much BB

Click the search button it has been posted I think.

use the powder calc and figure it out. it's pretty much the same to convert as everything else.

It should be the same as converting test ethanate. I'd make it 250 mg./ml.