Thank you for joining the thread, @Mwikali. 

Let me help you create your invoices and statements.

The first thing you need to do is create a bill for the 15% intended for the vendor, and mark it as a billable expense. To do so, you have to turn the feature on. Also, note that this feature is available for QuickBooks Online Plus. If you're not using this version yet, please upgrade your subscription first.

Here's how:

1. On the Gear icon, click on Accounts and Settings.
2. Choose Expenses.
3. Click on Bills and Expenses, and tick the box for Mark expenses and items billable.
4. Click on Save.

Here's a screenshot of how you can mark it as billable.

Once done, create an invoice for the remaining 85% which will be given to your customer. You'll then be given an option to add the billable expense to the invoice. This way, your customer will pay you a total of 100% for every job done. Then, you may create a statement for your vendor.

The other option you may consider is editing the billable amount from 15% to 100% once added to an invoice.

However, I recommend seeking help from your accountant. This way, they can give you further advice.

If you have other concerns, please leave a comment below.