Generate multiple distributions for a single distribution in SLA

We have a requirement to do the following:

Split an AR distribution into multiple SLA lines

For example, we want enter an AR distribution with GL account segment of 000000. In SLA we want it to split this distribution into two lines:

60% of the amount with GL Account 111111

40% of the amount with GL Account 222222

The allocation % will be determined based on a logic from PL/SQL package.

Is this possible using custom source?

Will appreciate your help.