@ Viq, "Don't think of group as combine. Think of a group as a quick way to select a bunch of objects and move them around, it doesn't really join them all together into one object but rather gives them a bounding box and a group name. In the history stack it shows EditPoly in italics which means you had more than one…
Okay to merge different objects together you use the attach button first then it makes two separate objects one. To use bridge you can do it in three ways The object must be an editable poly or have an edit poly modifier on it. bridge on edges. The edges must be open, as in they must surround a hole in the object. Select…