@ahmadhossain50
AFAIK there is no specific function in Max that creates a Quad topology Cap, but I have had success with the new Retopology Modifier in creating quad topology over areas with a single large Ngon. Of course the Retopology Modifier works on the whole object and you will have to play with the Face Count setting a little to get the density of polys that you want. But depending on your workflow, that might work for you.
There is also a script called Quad Cap Pro that will work on just the selected Ngon:
https://mariussilaghi.com/products/quad-cap-pro