Find classes that still need a room
Classes that have not been assigned a room will not appear on the rooms board. To find sections that still need to be roomed, use the Sections export and your preferred spreadsheet application to find classes with no room specified.
Run the Sections export by clicking the "Exports" link in the top right corner, then selecting "Sections." This will start a .csv download.
Open the .csv file using the spreadsheet application of your choice (Excel, Numbers, Google Sheets, etc.) and filter the "Room Number" column to blanks only.
The resulting filtered list is the set of classes that still do not have a room assigned.
Back in Abl, find the unroomed sections listed in the spreadsheet and edit section details to assign rooms.