What inspired this wish list request?
In a decision tree, one can use the Select Rows option under each red triangle to select the rows that correspond to the leaf of the decision tree.
And by doing so, the corresponding rows are selected in all open plots. Very convenient!
https://community.jmp.com/t5/Discussions/Highlighting-in-a-Decision-Tree/m-p/624915/highlight/true#M... 
How about the reverse thing:
A user selects some data points in a plot and then the rows show up in the decision tree.
Seems that this is not possible yet -therefore @Jed_Campbell suggested to write a wish list entry:
What is the improvement you would like to see?
If a user selects some rows or data points in a plot, the %fraction should be highlighted in the decision tree (bottom right) - similar to the %filling of the Histogram Plot (bottom left)
Why is this idea important?
The highlighting features in Jmp are very powerful, they help a lot during exploratory data analysis.
A similar highlighting function for the decision tree could help.
