Hello @Larasumitom! We have children that are different heights so I have been in the same position planning!
Unfortunately, there isn’t a way to sync up plans like that, but that would be an awesome feature to one day develop.
What the software can do is on any ride that has a minimum height requirement you can click edit and there will be an option to use Rider Switch, mark Yes and then Save. The software will then factor you doing the attraction 2x with the expected initial wait.
For the little one that cannot ride, I usually pick a nearby attraction that he/she will LOVE and make a note of it in the “Notes” area of the step. I find that usually the rides that are geared for her are not as difficult to squeeze in as the major rides with heigh requirements.
My daughter loves Monsters Inc & The Little Mermaid & those rides are pretty much walk-on if not short waits so we usually plug those in on the DCA side. Mater’s is also a great option for DCA. In DL she loves the teacups, Alice, meeting characters & the Buzz ride so whatever has a similar wait and is closest is usually what we take her to.
Also, at that age, I wouldn’t necessarily feel the urge to cram in as much stuff as possible. Your little one might just love exploring and getting to move around in some of the more walkthrough attractions such as: Goofy’s Playhouse, Redwood Creek Challenge Trail, Animation Building, Sleeping Beauty’s Castle Walkthrough. And even then sometimes we find that the rider switch is a good opportunity for our daughter take a break from the stroller wandering around a store or sitting on a bench with a snack.