So, I just checking the measure, not commenting on your exact steps.

Your first example has meter 3/4 but note beaming for groups of three, which implies you want triples of compound time 6/8 meter.

Here are examples.

Notice in the first two, the meter is 3/4 and the note beaming is in groups of two notes. The third shows 6/8 meter and note beaming in groups of three.

The second example uses cross staff notation. https://musescore.org/en/handbook/3/cross-staff-notation

Your example isn't wrong, but it suggest some kind of mixing of meters and accents, which sometimes is show like this...

The song America from West Side Story uses that kind of metrical feel.

I suspect you actually want the 6/8 feel. If so, change the meter, and then try notating in Musescore, it might go easier.

So, I just checking the measure, not commenting on your exact steps.

Your first example has meter 3/4 but note beaming for groups of three, which implies you want triples of compound time 6/8 meter.

Here are examples.

Notice in the first two, the meter is 3/4 and the note beaming is in groups of two notes. The third shows 6/8 meter and note beaming in groups of three.

The second example uses cross staff notation. https://musescore.org/en/handbook/3/cross-staff-notation

Your example isn't wrong, but it suggest some kind of mixing of meters and accents, which sometimes is show like this...

The song America from West Side Story uses that kind of metrical feel. But I don't think you're trying to do some fancy mixed meter thing.

I suspect you actually want the 6/8 feel. If so, change the meter, and then try notating in Musescore, it might go easier. If you aren't sure whether to use 3/4 or 6/8, think about how you would clap your hands of tap your foot to the measure. Is the measure 2 beats of 3 beats. If you're just tapping you foot twice, try 6/8 meter.