The Hotlink feature in ArchiCAD is a powerful design tool to enable the use of repetitive elements (e.g. repeated apartment fit outs) and or design options.
Key to the Hotlinking function is the Hotlink Master Layer, this is defined when placing the Hotlink, you need to ensure that this layer is visible in all layer combinations, otherwise none of the hotlink will be visible! If you have multiple hotlinks as design options you will require multiple hotlink master layers and multiple layer combinations (one for each design option).
In the standard New Zealand Template the Layer is called Misc : Hotlinked Modules