How to get there
Choose the Selection Tool and select two measures you would like to merge. From the Menu, choose Measures, and then Merge Measures.
What it does
This plug-in can be used to merge two measures created by the Split Measure plug-in, or it can be used to merge any two adjacent measures. It combines two measures selected with the Selection Tool into a single measure. Finale changes the time signature to represent the full value of the new measure. For example, if the first measure has a time signature of 3/4 and the second has a time signature of 5/8, the resulting merged measure will have a time signature of 11/8. Finale also updates the Measure Number dialog box accordingly.