There will eventually come a time when you want to add a visibility parameter to something in a family you are building or modifying....so I thought I would show you how to accomplish that.
For this example we will keep it easy...I took an out of the box Door Tag and added a filled region that will only be visible for Emergency Exit types of doors.
Visibility parameters can be used on other types of families as well...but in order for them to work in a Tag it must be type based.
Open the out of the box door tag and do a save as into your company library.
Add the filled region that you want to use in the tag to identify the EE doors.
Once we have the representation drawn for the special door type we will select all of the items we need, in this case the filled regions and the lines.
On the properties dialog next to visibility select the box so we can add a parameter.
Once you select the box it will open the parameter dialog box for us to select an existing visibility parameter, or as in our case, add a new one.
Define it as shown below, then OK out of the dialog boxes.
Now we are going to create a door tag that will have the symbol on and one that will not.
On the Ribbon on the Create tab, Properties Panel select Family Types
Add two new types...One named Standard and one Named Exit
Toggle the check mark off for the Standard Door and leave it checked for the Exit Door
Load it into your project and now you can use the new tag type for Exit doors