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i have read a bunch but none of them explained how to extend walls, but i got it figure out in the end, now i just got to fix the skybox and im set thanks for all the help

hello all i hope your all well, i was just wondering how do i extend an existing wall to make it longer? also how do i do kinda the same thing to make the ceiling taller? in hammer? any help would be great

is this even posible?

ok so i got a medium sized map with 3 different locals each with a portal machine, now what im wanting to know is, is there a way that with each machine there can be a computer and when the player hits the use key on the computer a menu will come up to where they can choose which portal to go to?