I'd be happy to provide information recording expenses to your QuickBooks, garethhowell.
First you need to create another bank account to represent FairFX as a parent account. Then, create a sub-account to represent each leaders.
To create a parent account:
To create sub-account:
Once done, you can transfer the funds to each leader.
Finally, you can now record the incurred expenses to each leader and use the associated accounts. You can refer to this article for the steps: How to enter, edit, or delete expenses.
I'm sure that with these resources, you'll now able to know how to record your expenses. I'd be glad to help if you have followed up questions regarding the recording process in QuickBooks.