Shabir, I did not suggest MA will meet with B-17 at GT. It can be seen on wikipedia that it meets at Sangjani which is approx 2.5 km from B17 main entrance. In fact this is what I wrote:
"...Multi has got motorway interchange approved at its B-17 Sector F. Together with Margalla Avenue, it will join its Orchard, B-17 and E-11 projects. Tarnol interchange and widening of Fateh Jang road will also link up F-17 nicely with GT and MW."
Kashif has given pointer to Multi Residentia/Orchards brochure which says that MA will extend from Sangjani to meet with M1, thus it will connect B-17 with E-11 through MA.
I have one additional information, that Multi is paying for an interchange that will connect B-17 at its sector F with M1. If this happens (and if Tarnol flyover built with Fateh Jang road dualization), then all projects of Multi will be nicely interconnected ... Orchards, B-17, F-17 and E-11.