Note: you need Glossary Converter 3.1 or later to change the content type.
I won't go into too many details here, since anyone who wants to add fields probably knows what they're doing. You'll see this dialog (first screen shot: with Glossary Converter 3.1, second with lower version or no Glossary Converter):
There is a restriction here: you cannot have the same field name on multiple levels. For example, you cannot have a Notes field on both term ad entry level. Use a name like Entry Nodes for one of them, or use the MultiTerm wizard to create your termbase.
Created with the Personal Edition of HelpNDoc: Produce Kindle eBooks easily