My post last Saturday reminded Daniel Stine of a situation where he used a similar technique.
In an Electrical Equipment schedule, we want the Room/Space number to be listed automatically. However some items are not located within a room. So we use a Yes/No parameter (in the family) and a calculated value (in the schedule) to switch from automatic to manual. In the example below, the rooftop equipment is not within a room and would produce a blank cell if the schedule column just listed Space:Number. With the toggle, we can type in a custom value; a word in this case.
These are the two manual parameters associated with the content:
Calculated value in Electrical Equipment schedule:
if(Enter Manual Room Number Name, Manual Room Number Name, Space: Number)
The follow parameters need to be added to the schedule, but hidden:
Enter Manual Room Number Name
Manual Room Number Name