Auto Create Line item of a record into line item of an existing record of another BP

Dear Sir/Madam,

I would like to know is it possible to auto create line item of a completed record into line item of an existing record of another BP?

We have two business process. BP 'A' is leave request and BP 'B' is Annual Leave management. When User request leave and their request is approved, we want the completed line item of BP 'A' auto create into line item of existing record's line item in BP 'B'. We don't wish to have another record created in BP 'B' after each auto creation.

Is this kind of design possible in Unifier, especially by using auto creation?