Hi there, nccollins36.
You can create a service item for each project and add them to your check. To separate the posting of the expenses, you can assign a specific expense account per item. To do this, just open the service item, put a checkmark in I purchase this product/service from a vendor, then assign an Expense account.

If the check is billable to the projects, you can mark them as billable like in the screenshot below.

You can run a Profit and Loss report after writing a check.
That will do it. You can always go back to this thread if you have other questions.