Using a RP (ref point) is the answer for your case. You can find it in the 'tools' menu. It is possible to create RP at arbitrary location which is not connected with geometric things. After RP defined, you can use it as a loading point, constraints point, et al.
You can create points by defining coordinate at the add point section. Even though it might be a hard way if you do not know the map coordination in which you create the part.