This tutorial applies to whole sims that have been downloaded and installed from Sims2Packs, or those whole sims created in Body Shop's Create A Sim on your own system.
Once you are in the game and have gotten to the Create-a-family, Create-a-student, or Create-a-Sim screen:
1. Click the Sim Bin button on the console:
Figure 1.
2. Now look through the models until you find the one you want:
Figure 2.
3. Click and select it, you will see the Sim in the CAS area change. Click the check mark.
Figure 3.
4. All done!
Figure 4.
now add the rest of the clothing, the personality, etc!