This feature allows you to edit multiple data fields at once. To use this feature, select the materials you wish to edit by clicking and dragging over them. Then right-click to bring up the various options available. You will be able to see the option to group edit these selected materials as shown below:
Once you have selected 'Group Edit' you will be able to click on the inputs that you wish to edit for the selected resources. Click to edit the relevant fields.
Once you have made your edits, you can click on 'Update values'.
The changes to the materials should now be reflected in the building materials query.