Retentions

Infusion does not have the function to handle Retention's automatically. 

Option 1 - Deferred Payments

Invoice out the full amount and receive the balance paid.  Enter a credit for the balance and raise a second Invoice for the retention.

This second invoice can then have a Deferred Payment set up (it is recommended to use random dates).

Option 2 - Progress Claims

Set up Progress Claims and invoice as agreed.  Leave the Retention until the last invoice.