Hello,
1. You can find some documentation on the support.sas.com website, specifically here:
http://support.sas.com/documentation/onlinedoc/simstudio/index.html
2. It depends a lot on what kind of resource planning problem you have.
PROC OPTMODEL can formulate linear and non-linear programming models, in the linear case including integer variables, that's probably what you are looking for.
There is also a framework for genetic algorithms (PROC GA) and a constraint programming solver (PROC CLP).
If you think in terms of ERP, SAS also has a proc for Bill of Material Processing (PROC BOM)
Philipp