How to Split Internal Sales Orders lines based on On Hand Availability

How to Split Internal Sales Orders lines at Order Import. We have an OM System Parameter in R12 - Scheduling Auto Split Criteria. This System Parameter will split the lines based on On Hand Quantity. For Example

set - Scheduling Auto Split Criteria to With Partial Substitution

For Online Orders

Ordered Quantity - 100

Available On Hand - 60

On Booking

Line 1.1 split into

1.1 with 60 Qty and

1.2 with 40 Qty

I need to use same functionality for Internal Orders. How do we do it