First, you should really be using something other than plats since they are notoriously buggy and their effects can basically be acheived by other, less buggy entities.

Second, to reset stuff every round in counterstrike, you want to use whats known as the "door hack". details here:

http://countermap.counter-strike.net/Tutorials/tutorial.php?id=7

The basic premise is that func_doors reset themselves each round.

The tutorial actually does work for anything, you just are not understanding it completely. The whole idea is not to reset the func_door, but to reset other stuff that normally does not reset by using the fact that func_doors reset.

The func_door in the tutorial is not actually a door in your map, but rather just a door sitting out in space whose only purpose is to trigger a multimanager when the round resets.

Anyways, if you want to use a func_door for your map instead of a func_plat (totally different from using a door hack - here you are just using a door in the first place), then you can make it go up like so:

The "angles" key (you might need to turn off smartedit to see it) is specified in P Y R (Pitch, Yaw, Roll). You can EITHER choose to specify 90 degrees of pitch in the "angles key" OR choose "UP" from the options by the yaw angle spinner. Don't do both - theres a bug in hammre that can cause trouble sometimes if you do this.

Here is a diagram of PYR: