You can now setup a future instalment without specifying a date to this charge - the charge will be based on a Milestone instead.
For example: You could accept an amount upfront, and then charge the rest of the payment upon acceptance into a program.
Add your Price as normal
Go back to your List Prices and select the Price you've just added
In the Instalments section, click the + Add an instalment button
In the Instalment pop-up screen, select the Milestone tab under the Wait for option - then enter the Milestone and Instalment amount:
Click the Save changes button.
A FEW THINGS TO NOTE!
You will need to MANUALLY collect the instalment on the purchase when the customer reaches the Milestone you set. The system will not be able to do this automatically.
A Milestone instalment can only be followed by another Milestone instalment!