Payment program configuration

Hi,

We have a payment program config issue. We have around 14 company codes. For all the company codes we have only one paying company code 2000. Now for a company code 1000, we want to pay some project related expenses by the particular company code only (ie1000). But all the other usual expenses to 1000 would be paid by the company code 2000 itself. So, technically, we need to pay the expeses incurring in company code 1000 part by 1000 and part by 2000. How can we achieve this? What might be the work around for this?

Thank you in advance.

Regards,

Avin