How to invoke Workflow through RunTime Events in Siebel

Navigate to Runtime Events - Action Sets

Create new Action Set, Provide the required fields.
Create new Action Set Type and Provide the Action type: BusService
and fill the remaining fields as below:

Business Service Name: Workflow Process Manager
Business Service Method: RunProcess
Business Service Context: "ProcessName", "Your Workflow Name"

Go to Events views:

Create new record, provide the required fields like Sequence, Object Type (BusComp/ Applet), Object Name, Event (on which you want to run the action set), Subevent (if you want to add your method) and Action Set name.

Go to Menu button and click on Reload Runtime Events