Switch from IV to infusion dosing when graphically building a model

Hi

I want to switch from an IV bolus to a very short duration iV infusion. In the model setup the dosing work sheet only has a A1 and Time, which was fine when I was doing the bolus but now I want to do the infusion so I need a the duration column. I am not sure how to recover that column as once you start graphically editing a lot of the controls break.

Any idea?

Thanks in advance.

Never-mind I need to click on the dosed compartment to get to those options.