Hi Aneel ,
If you are still looking for answer , please create process model in Tcode-PEST with all the programs and variants and Use Tcode #PUST to execute the same . Below links will help you .
http://scn.sap.com/community/erp/hcm/payroll/blog/2015/06/24/customize-hr-process-workbench-pust
Thanks
Sarath