These values were updated on 10/11/16
This article shows an example of how the medical baseline for PG&E is inputted in a custom rate. The medical baseline is calculated by adding an additional 16.438 kWh per day to the tier 1 of your PG&E rate.
1) Create a duplicate of the PG&E rate by clicking on the duplicate button to the right-hand side of the rate.
2) Modify the number of tiers and the values within those tiers.
Here is an image of the E-1 Residential Utility rate in Territory S Code B. 
We will add 16.438 to the first tiers of both periods. Consequently, the second tier will be pushed 'back'.