Hi,

we created a few Item Groups (IG) for lists of items which we want to keep together. It turned up to be the wrong solution - the items need to be in different categories - and we ended up using a different approach, creating a custom field and getting the lists via that field.

But now I have the lists with many items, and even in UI it doesn't seem to be a way to remove multiple items from the IGs at once (as, for example, it is possible to select a number of items and add them to an IG).

Deleting the lists isn't an option as we do need to continue using those items.

In API doc, I didn't find a way to remove it. The differences between two items (one standalone, one in an IG)  are group_id, group_name and then 18 attribute_*; I tried to PUT an item with the first two set to null, but that didn't work.

Can someone help please? I just need to do it, so it could be UI, or API.