Trills above and below, one stem only?

[LAE]

Hi all,

I have managed to achieve this in a slightly convoluted way. First I did this:

Then I change voice 2 to voice 1:

…and then I flip the upper trill to below:

There must be a smarter way of doing this, right?

Thanks in advance.

[Janus]

I think the easiest way is…
Do your step 1.
In Engrave select only the lower voice minim.
Flip and set the voice column index to zero.

Job done.

[LAE]

Thanks, that’s a bit quicker.

I also tried to do this with divisi and condensing but that does not work at all –

No option makes the stem to be shared, retaining the two trills.
If I manually condense into voice 1, the lower trill disappears.

[Janus]

The same method works with condensed divisi…

[LAE]

One has to use different techniques for different places. Here I had to use @Janus 's voice column method in order to have the accidental show up on the trill: