Click the Invoicing button to indicate the project's invoicing method. Select Onward billing based on purchasing and time sheet input from the drop-down list.
Enter the account number for the project in the Account no. on invoice field. If there is no account for the project, select the one that is registered in the company settings.
Enter a Fixed text on invoice if you want all invoices for this project to have default text.
Click New to
create a new line in the Invoicing plan. A new line will be inserted where
you can select Status and Amount as well as a Comment.
Click the Invoice button to open the invoicing wizard.
Follow the five step wizard to complete the invoicing process. Enter contacts, purchase lines, time sheet input, status reports and default information linked to the project.
Click the Search
button in the wizard's first screen to select the contact (and company
contact) you wish to create an order for. Click Next.
The products that can be invoiced are displayed in the Not included field. Select which product/projects you wish to invoice and click the arrow button that points to the right. The products will be registered on the invoice. Click Next.
Select which hours from time sheet input should be invoiced in the next level of the wizard. The process is the same as for products.
Click Next.
Click Complete to create an order.
You have now created an invoice based on
the purchasing and time sheet input. 
Note!