Click "Export .xlsx" to receive an excel spreadsheet with two columns. First one has all the labels and the second one has recoded labels. You can edit this file and then import it back to Query.
Import:
Click "Import .xlsx" and choose an excel file that you want to import. You have to remember a few rules:
The first column cannot have any duplicates, if it does you won't be able to import it,
Query reads the first column until first empty cell,
Labels and recoded labels are case sensitive (it matters whether you use uppercase or lowercase letters).
Exported file
Imported file
After you import new mapping, Query will inform you about the number of found and imported labels:
35 found labels means that Halo Reports found 35 not empty cells in first column,
35 replaced labels means that 35 names from the first column matched with labels and were assigned new recoded label.
Remember that only exact matches will have the new recoded labels assigned to them.