If you wish to view invoices under multiple names as a single customer, it is easy to merge customers.

To combine invoices being listed under different customer names, on the Customer tab, go to the cogs icon at the top right.  Then select 'Merge/Rename Customers.'

Tick the boxes to the left of the customers you wish to merge.

The last customer you select will be the name that survives the merge - the others will be nested under that one.

To unmerge, see How do I unmerge customers?