New resource type: book portions; combine two tabs for journal articles when bookmarking

We have feedback from an academic: I have spent more than 1 hour to try to add a book portion (NOT a whole chapter) and still could not add it. So, we would like to see an option to add book portion (as a new resource type) with multiple page ranges (might be from different chapters).

Also, some academics have found the two tabs for journal/conference articles are confusing. Is it possible to combine the information into one tab?