Visual Studio 2017 is offered in different editions, Professional, Enterprise or Community Edition, that can all co-exist on the same machine. When you install Visual COBOL, its setup file installs it into any edition of Visual Studio 2017 installed on the machine.
If, after Visual COBOL is installed, you install a different edition of Visual Studio 2017, you can use the MFVSIXINSTALL utility (available in the Visual COBOL installation directory) to plug Visual COBOL into that edition.
This starts the VSIX Installer utility that will install all the required components into the existing editions of Visual Studio 2017.
For a list of all parameters execute MFVSIXInstall -?.