excisie invoice clubbing

Hi Friends,

How we can clubbed together all excise invoice in to commercial invoice.

For example I am having 5 different excise invoice for whihc i need to get one commercial invoice how it can be achieved?

please help on this.

Also is there any stanedard report to view billing doucment tracking? I mean one could able to see corrosponding doucment for billing doucments.(like sales order, delivery)

Thanks in advance