Joiin will provide an option to eliminate by contact for any Sales Reports. This will mean that intergroup invoices will not appear on any of your sales reports.
NOTE: Eliminations made on Contacts within Joiin will not affect GL Account balances on Financial Reports, only the Sales Reports. You can read out guide on eliminating GL code balances here.
Eliminate By Contact
To eliminate by contact in Joiin:
1. Click the Settings Cog in the top right of the page and select Eliminations
2. Select the Add Elimination Group button

3. Using the Top Box in the pop-up window, enter a name for the elimination
4. Click the next box down titled Elimination Method to change from eliminating by account to eliminating by contact

5. In the first line titled Company 1, select a Company and Contact to eliminate

6. Further Contacts can then be Eliminated by using the Company and Contacts boxes under the second line
7. To continue eliminating contacts within this group, click the Add Company button in the bottom left corner of the pop up window

For more information on managing eliminations and elimination sets, see this article