Irregular Shape Opening (For model exchange and opening schedule purpose)

Hello All, 

I wanted to make irregular shape openings using "Place User Defined Type - Peneration" in OpenBuilding Designer where only rectangular and circular openings are available. This is not for actual slab or wall cuttings but for information exchange and creating opening schedule purpose. I cannot figure out how to do opeing with trapezoid shape as per below screenshot (green highlight). Kindly advise. Thank you. 

Regards, 

Thiha