Hi Leah
Label formatting is a fairly complex things, especially when you start taking into account the need to respond to rotated views, flipping/mirroring, rotation and anchor points. If I need to make a new parametric one, I usually start by taking a standard Graphisoft supplied labels and modifying it.
The parameter that holds the location of the label text relative to the leader is Label_Position, so have a read up on this in the GDL reference guide and check out a few existing labels to see how it is being used.
Alternatively, the functionality you seek has already been added to Archicad 23 by Graphisoft. You can now set the leader of the text/auto text label to start in the middle of the first row of text.
Hope that is of some help
Cheers,
Michael.
