Move up values when null Power Query

Question

At this moment I have a big table in Excel that I would like to use with dynamic dropdown (cascade options). Depending on the selection you do on the first dropdown, then in the

Answer 1

Since the columns are independent, you can turn each one into a list, remove the nulls, then combine them back into a table.

Table.FromColumns(
    {
        List.RemoveNulls(Pivot[C1]),
        List.RemoveNulls(Pivot[C2]),
        List.RemoveNulls(Pivot[C3])
    },
    {"C1","C2","C3"}
)

Result:

This can be made more dynamic if the number of columns isn't always three but the same idea should apply.

---

Edit:

It's actually simpler than I initially anticipated to make this dynamic, independent of the number of columns and their names:

Table.FromColumns(
    List.Transform(Table.ToColumns(Pivot), List.RemoveNulls), 
    Table.ColumnNames(Pivot)
)