The procedure for adding any other partial loadable is the same. You must browse for the MNS or MNC file, which contains the partial loadable menu. Then using the Menu Bar tab, reposition it on your menu bar. Once you have gone through this procedure, the pulldown menu will be permanent until such time as you inadvertently type Menu again and reload the main AutoCAD menu file. At least this way you don't have the problems associated with your users losing their menus because everyone is working off of a common menu.
Most users have a distrust of changing the acad.mns file directly.
They would prefer to have their own menu file. Therefore, a common procedure is to first copy the acad.mns file then rename it to your own company-named file. If that is your procedure, there is something you have to watch out for. Let's assume that you have made a copy of acad.mns and called it mynewmenu.mns. You now proceed to make your modifications.