we have a back engine tool which is CIMM TOOL for web application, the functionality of this is as follows:
1.the admin can login to the tool,he can assign the role to the users(CSR) with specific privileges
2. he can change the price that should reflect in front end
3. he can manage the order from the tool.

my question is how to write test cases for these conditions?
please can any body help me regarding this???