Billing for upgrading yearly services (prorrated services)

[virtualorbis]

We usually receive requests for upgrading services
so then we have to manually calculate the upgrade cost and this takes us a lot of time,
so I wondering if you have a better way to handle these issues.

[activa]

This should be done auto. You need to put packages in same group and allow upgrade/ downgradewith checking the checkbox.

[WebhostingNZ.com]

as activa has said this is done automatically, how are you upgrading the services?  Click 'Manage', under 'Upgrade/Downgrade' change the service to the new service requested and have 'Prorate' ticked.  It will show the subtotal down the bottom right of the screen, when you click save it will invoice them for that amount and depending on your settings will either upgrade on the spot or wait for the invoice to be paid then upgrade.

I can't recall properly but I think it doesn't work with override price.  You also need all of the packages in the same group to be able to upgrade/downgrade between them.