payments parallel to the subcontract

[MashaTs]

payments shall be parallel to the subcontract with the design company.
Что подразумевается под "parallel to"?
Контекст:
Пункт: Possible payment scheme for design work
For payments on the design portion of the Works, payments shall be parallel to the subcontract with the design company. Payment amounts and terms shall be as follows:

______7 days after signing the present Contract as an advance payment;
______ months after signing the present Contract upon completion of the permission design study and commencement of working drawings.
Спасибо!

[Karabas]

Платежи осуществляются параллельно с заключением субподрядного договора

[tumanov]

imho, here 'parallel' = 'back to back'

[tumanov]

.. условия оплаты должны быть без изменений/один к одному / "параллельно" соответствовать условиям по договору субподряда с design company...