User for SRM auto-approver

Hi Exports,

I am looking for a User ID which has a capability to automatically approve the work items in SRM..

Please advice me about the possibility of having such type of User ID..

I need this type of user because, If my SC has multiple line Item but out of which only one need approval and rest items can skip the process level. While populating the approvers for the line items I need some user ID which can approve the work Item automatically like system user in order to continue my work flow to next process level..

Regards

Bharath