Using SliQ Plus's template designer you can change the columns shown for invoice line items, e.g. you can add an item number or a date column. As an example, this video tutorial shows how you can remove the Quantity and Each columns to create a service invoice template:
Note that when you are entering line items for an invoice, SliQ Invoicing may show columns you have removed from your invoice template, e.g. the editor for a line may still show the quantity and each columns, however, when you print or email the invoice, only the columns you selected in your template will be included.
For more information, see:http://www.sliqtools.co.uk/onlinehelp/configuring_columns.htm