Cascading Drop-Down Lists with Editing in TypeScript TreeGrid

You can achieve the Cascading DropDownList with Tree Grid Editing by using the Cell Edit Template feature.

In the below demo, Cascading DropDownList rendered for Priority and Duration column.

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.