Grid constant sum question with Column totals

Question

The solution in the linked post is almost what I need.
https://legacy.sawtoothsoftware.com/forum/32428/countdown-constant-sum-in-grid-question?show=32428#q32428

How would I modify this to have the question work more like the built in constant sum question, just with multiple columns, and each column having a total at the bottom? The total being the rows above it added up to 100?

Answer 1

If you use a grid question and make it column direction, then each column can be set as a constant sum and you can check the row option to 'show totals'.