It depends. If there is an income document for yourself that includes the payments you made to the landlords, then you would enter the money you paid them as an expense of your property management company. If you report only the income you received as property management then there is nothing to report for the landlord portion of the payments.
If the expenses you paid on behalf of your landlords is included in the income for your property management fees then you would deduct the expenses you paid for the property owners. If you report only the income you received for your property management there is nothing to report for the landlord expenses.