visual studio - T4 generating Script.PostDeploy.sql sqlcmd -

i want generate script.postdeploy.sql on sqlproj, using t4 template , have 2 issues:

first, have sql var read within .tt in order define wich folder want load files build final script. possible?

second, when run .tt, writes sql, changes action in fike properties postdeploy build. there way of changing instead of editing sqlproj? (here)