Free Form Application Creation for different year cubes

Summary:

Currently we are having different application with respect to different year which is ASO cubes . We are planning to create a single application which contains multiple ASO cubes with respect to different year data

Eg:- Cube 1 - 2020 data ; Cube 2- 2021 data; Cube 3 - 2022 data

having below clarifications with respect to the same it would be great providing inputs on the same

1) How many ASO cubes can be created in single Free Form application?

2) Can the Dimension can be different from each cube?

3) If we have On Prem Files like OTL and .dat files can we create cubes with help of the files in the cloud?