Hi Jeff.
This kind of notation requires a little bit of tweaking, especially on the top staff. (1) Input the last notes as last quavers of the bar, (2) remove the rests before them, (3) hide the stems (property in Engrave mode) and select source and target note, (4) shift-O “gliss” (or use the appropriate panel, but that’s not really the Dorico way, is it?) (5) Change gliss to gl. in the appropriate property panel field. Wait. No, that’s not possible. You’ll have to cope with gliss., port., no text — or write something with shift-x, but it won’t be slanted.
At this point, it should look almost as you wish. (6) Use shift-x to input parenthesis (with avoid collisions disabled in Engrave mode properties). (7) Use the Note spacing sub-mode in Engrave mode to move things horizontally as you wish and you’re set to go. I’d rather do that in the last steps of the engraving process, as you’ll know then how much horizontal space you posess for that bar.
Hope it helps !