Place doors.. skill for dooframe?

[ash1ey 0]

I've been trying to find the skill that will allow me to craft a doorframe but cant find it anywhere?!??! Anyone point me in the right direction? I have a door made just cant make doorframes.

[mizunami 40]

when placing a wall, press t to change the type of wall, ranges from window frame to door frame, to half way, to railings

[ash1ey 0]

Thanks!