Request Workflow for Servicedesk 7.5 SP1

Hi,

I need to create a Workflow similar to Incident Management in which I have to create.

1 A form which will create a ticket but should assign a custom ticket Number like RQ0001 and later it can be tracked with this ticket number.

2. It should have a SLA and auto calculate priority

3. There will be custom categories from which we will select the category of the request

4. Move to next level based on approvals or send for approvals.

5. Reject the request if no approval received.

is it possible in Symantec Servicedesk 7.5 sp1.

This workflow will be used to create request for Software/Hardware