[Koha] Group assignment

Dear Koha Folks: We now have our teachers in the Koha database, and the librarian is beginning the process of putting books in. However, she needs to assign a spine label to each book. I assume this is done through the "Group" process. Yet, when she goes through the Koha acquisition there is no place to assign a group. The online manual shows a place to assign the group when you acquire a book, but our Koha does not have it - either with the Marcs tool or the three-step process. We show a "type" field - it is blank, and accepts no input. I do not think "type" is the same as group. We do have a place to modify a group, but no groups are listed. Am I missing something? Sorry for the confusion...... Thanks! Robert Maynord