You didn't get the point of my response. You can export models...not model groups. The subject says model export. There's no way for me to know that meant a model group and your topic description didn't tell me the model name or anything just said you tried to export so I had to guess what the heck you were exporting.
You must not have been around when we've discussed the issues with model group export. Do you know the format of an export? It doesn't contain any channel information its just a raw dump of a bunch of sequential channels. But in a model group you can have several models with big channel gaps in-between and the export format has no way to represent that so we would be giving you a bunch of "black" information that might overwrite other in-between models on your target sequence.