When adding a contract, how can I add a new role to the drop down menu?

You can add your own staff roles if you go to; Admin > Personnel > Custom Roles

Here you can see all the current staff roles on your ScholarPack system, and add additional ones which you can map to a DfE code. To add a new role, click "Add new" 

You will then be able to input the role you need and map to a DfE code and click "Submit."