I have described in the previous articles music intervals and transposition logic. I will describe here how to operate them with Flat.

To perform a transposition:

1. Choose the selection toolbar

tool-bar

2. Then select the measures on which you want to perform a transposition

selection

3. Click on the transpose button

transpose

4. Choose the transposition interval

menu

You can choose the number of octave to shift, and an interval. The interval value define the diatonic part of the transposition interval. The chromatic part is defined with the check-box. As you can see you can have a preview of the effect of the transposition interval you choose.
Click on the Transpose button to finish the transposition. You can select multiple measures to transpose. The ties will be preserved accross the same measures, but the cross-measure ties might be removed.

Transpose a sheet music