You can enable or disable the ERP dependent modules from WP Admin Dashboard → ERP Settings → Modules.
This is probably one of the most sensitive parts of the core settings. As we create more modules and people start to use them, this will come in very handy for maintenance.
You can enable and disable any module you want. If you want to use only the HR Management module, then simply un-check CR Management and Accounting. This will not create any incompatibility or problems within your ERP system. You can do the same for other modules as well.
After enabling or disabling the modules, click on the Save Settings button.