If you have sites where the meters are being changed, you can create virtual meters to connect the meters, so it appears as one.
To create a virtual meter, go to
Settings → Meters
You can search for the site where the meters are located, mark them in the table and click Add To New Virtual Meter,

You will then be asked to name the new meter, and choose what type of meter it is. Yuo choose the type of operator, and then choose wheather the virtual meter should be included in your total consumption, or you want the input meters to be included. Click Save and the virtual meter is now created.

If you go to the virtual meter, you can go to Virtual Inputs and see which meters are part of this virtual meter.

Within Virtual Inputs, you can also set input rules, if you want to tailor it further.

Once you are done setting up your virtual meter, you can go to the site it is allocated to, and see that the meters are now connected and the virtual inputs are not counted in the total (if that is what you’ve chosen).
