Product Enhancement category - workbooks

Submitted a couple of product enhancements this morning. 

1) limited use of premium apps in order to demo the features to senior management who are able to authorize the additional costs

2) default user dashboards so that admins can push content to user dashboards and users can self organize. 

Anyway back to workbooks, ...... when i was submitting the requests I noticed that the last option in the category dropdown was "workbooks".  Does smartsheet have a workbook feature?  If so can someone post a link?  When I search,  I only see are community posts requesting workbook features. 

Thanks!