Archislave:
The reason the TS column cannot be made smaller than 8"x6" is that this is the size of the Complex Profile, and Complex Profiles can be larger, but not smaller, than their original size (in the Profile Manager).
Two options:
1. Edit the TS Steel Section in the Profile Manager to be the smallest size you want to use (I am not sure how this would effect already placed profiles)
2. Create a new Complex Profile the smallest size you need
David