How to bring in a measure into the Forecasting Profile Input Measure?

We are currently utilizing Final Bookings History measure for our Forecasting Profile Input measure. I'd like to copy the Final Bookings History measure and add to the expression to capture another measure. I've already created a New Final Bookings measure and added it to the measure catalog, but I cannot see it as an option in the Forecasting Profile Input Measure? How do we get the new measure to show up in the Input Measures?