Thanks for getting back to us, @Beth Renee. I'll make sure you're able to separate your expenses accordingly in QuickBooks Desktop (QBDT).
Based on your description above, you'll need to create another set of expense account. This way, you're able to separate your billable expenses that correspond to your 1099s and avoid the delivered customer to offset the expense in the freight expense account. Then, show the appropriate vendor name on your reports (i.e., Profit and Loss).
Go to the Lists menu.
Select Chart of Accounts.
From the Account drop-down, select New.
Select the Expense radio button, then select Continue.
Complete the account details.
Select Save & Close.
I've attached screenshots below for your reference.