Milestone invoicing capability in PJC module

Hi,

I am looking for a milestone invoicing capability in PJC module.

AR invoices should be created based on the progress of project as below.

1)    At the time of contract ----- (10% of total project amount)

2)   2nd billing ------- (20% of total project amount)

3)  3rd billing ------- (20% of total project amount)

4) 4th billing ------- (20% of total project amount)

5) 5th billing ------- (20% of total project amount)

6) Completion of project ----- (10% of total project amount)

I wasn’t able to see this kind of functionality in the standard version of Sage 300 ERP.

Do you have any idea or workaround to manage milestone invoicing in PJC module?