Imported group does not show up

Hi, Just converted from GW6 to GW8 and tried to follow the rules for creating a group using export of group and then import of file. However, the import does not yield any results, either to an existing group or to a new group. GW only allows import to the major groups (e.g., Frequent Contacts) and not the subgroups.

Can anyone shed light?

Thanks!

Lisa