Adding data field into invoicing template

Is there a way to add another field/s under addressee details for invoicing templates? 

For instance, I want to direct an invoice to a client representative, rather than the organisation as a whole.  See example below of what we currently have populating our template: 

Organisation Name

Organisation Address

I want to direct our invoice to perhaps the account department and a specific account manager, like below: 

Account Manager

Organisation Department

Organisation Name

Organisation Address

I’ve attempted to rectify this before by changing the debtor, but for reporting/billing purposes its not ideal as SB lists the debtor as the account manager, rather than the organisation as a whole. It also can get confusing if the account manager moves on from the organisation. 

Does anyone have any recommendations? Thanks!