In an effort to reduce the clutter when setting up the Equipment Sales Module, starting with 11.0 only the Series and Models that are selected for your company will display in the Brand/Series section.  For example, maybe today there are 50 models for an existing Series, but only 7 are selected for your company.   Starting with 11.0, only the ones that you have selected for your company will display initially.

Now, the items that are not displayed are not deleted.  They are still available via the "Brand/Series" link and can be added using the new buttons - "Add Series" and "Add Models".