Wokka,
The first three options for Labels (Text, ID, Unique ID) do not use GDL Script. They are all a single line of text, with a Leader in front of it.
This is why you cannot open the GDL Object, because they don't have any.
About the Hotlink Master ID: it can be set in the settings Dialog of the given Hotlinked Module:
Make sure "Suspend Groups" is
OFF.
Select your Hotlinked Module, right click and select
Hotlinked Module Settings from the context menu.
In the appearing Dialog you can set it in the
Master ID field.
Loving Archicad since 1995 - Find Archicad Tips at x.com/laszlonagy
AMD Ryzen9 5900X CPU, 64 GB RAM 3600 MHz, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), Windows 10 PRO ENG, Ac20-Ac28