Dynamic Selection based on 2 dimension

Hello Experts

We have 2 dimensions Viz Entity and Product.

If the user selects the entity then the respective product should be reflected in input template.

for eg..

ENTITY: 2000, 2100, 2200

PRODUCTS: ABC, DEF, HIJ

if the User selects 2000 entity only product related to 2000 ie ABC and DEF should be shown.

if the User selects 2100 entity only product related to 2100 ie HIJ should be shown.

Any inputs on the same will be of great help.

Regards

ATG