Invoices are created in batches. You tell Service Manager what date range you would like to invoice up to and it will show you all of those customers that need an invoice creating. For example if you invoice monthly you would create an invoice run for the whole of April, putting the invoice date as 01/04 and up to the 30/04. This will show you any customer that needs invoicing up to the end of April. Using this method there is nothing to stop you invoicing weekly or any period you like.
Service Manager also picks up any customers that have not been invoiced on previous months. For example if you choose not to invoice a particular customer in March it would still show as requiring an invoice in April.
If you have a customer with multiple agreements, you will see each agreement listed under the To Create tab.
For example taking our customer 'Star Coffee Ltd', that has two monthly agreements one for a site in Milton Keynes and the other one in Bedford. As shown below, both agreements can be seen. As both agreements are on the same account code when you tick one line the other is automatically ticked. You cannot create one line without the other.
By ticking a single line, both lines are automatically selected.