You can have multiple licenses on one computer. Every successfully activated license is automatically added to the license file.
If all the activated licenses are the same type (standalone, network), you only have cgs.lic and serial.lic files.
If you have mixed standalone and network licenses on one computer, you have to have separate files for each type. In this case, you have to rename one of the files (in CGS.lic you have standalone licenses, and in CGS_1.lic you have network licenses), License Manager can handle both regardless of the name.