Some of our energy sources fuel only domestic consumption. For sources used in domestic and production, how can we enter the data if the tracking is currently not separated between the two?

If you separate the monitoring of domestic VS production, you should have sub-meters set up to read between the two to answer "yes" to identifying and tracking separately.

If you separate at least 80% of your energy sources between the two (domestic/production), you can also estimate and allocate proportionally to the relevant fields. Consumption should reflect the same as total consumption in the sum of both domestic and production.