Why wont css come up in source sdk

Refresh your source sdk content, make sure you have CS:S installed first and is a legitimate copy. Then refresh SDK content, this should fix the problem.

If not you can create your own CS:S build by clicking "Edit game configurations" and then click add on the window that comes up.

Now you need to type in any name for your CS:S build then in the box below browse to the location where CS:S is installed.