John,

As John Ford and Mario have indicated, your choice of 6/8 immediately makes this challenging and explains why you are having problems. It's a pity you didn't begin with 4/4 or 3/4! I imagine it would have then been plain sailing for you.

While it's possible to set a time signature in BIAB, ultimately, it is the style that's loaded that determines the time signature of the backing.

To import your created melody into BIAB, my initial feeling is that it may need to be rewritten. If the melody is more along the lines of a Sousa 6/8 march, a 4/4 swing style can be made to work and would be the best option. (See the image below that uses Editable Notation Mode in BIAB set to a swing with a 4/4 time signature.)

With the below image in mind, if you wrote the melody using each beat of 4/4 as 1/8-note triplets, it would read into BIAB fine if a swing style was chosen. When creating such a melody, it's necessary to keep in mind that one bar of 4/4 will contain two bars of translated 6/8.

To test this, simply create a 4-bar melody; save it and import it and see what happens.

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6-8 melody in 4-4.JPG (34.81 KB, 107 downloads)
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