It can happen that you have 2 parts of one test result separately.  In that case they appear as 2 lines in the results grid.  But you may prefer to combine them into one line.  If this merge is ‘legal’ (see further), this is how to do it.

Here you see 3 results of loudness scaling, at 250, 1000 and 4000 Hz.  The results have been saved separately.  There are 3 lines in the grid and each part has its own colour in the graph.

To merge these results, use shift or ctrl-mouse to select the lines you want to merge and click on Merge Results.

The results are now merged, they have one line in the grid and one same colour on the graph.