Ramp connection in between elevated viaduct and at-grade portion

Dear All,
I cant establish an interchange ramp connection between elevated viaduct and at-grade sections. I have attached a screenshot of the area that need to be interchanged. Also attached the working file in the link below for your reference.
Appreciate if anyone could guide me on this matter. Thanks in advance.

Folder Path: 1drv.ms/.../s!Atg_UdzhTl5cnN989yubVVJJdRoGoA