I use subscriptions to create my monthly invoices. I need to add a extra line to each invoice of which I know the amount four days after the new subscription period is started.

All invoices are created and booked. I need to set them back to draft en then add the line and then sent them out.

I know in version 15 there was this option to create as draft and there is a plugin for sh and on prem. 

But what can we as online enterprise user do to get this working? Some say to create a stage "Invoice pause" but I do not see the "stage"option under configuration in subscriptions.