Table: expand and collapse columns

You need to build a table to define how you want the groupings.

For example:

Group1    |  Group2

A              | Total provisionado

A              | Prov Caja

A              | Prov Img

B              | etc...

Then, on the matrix, you add both fields to the Columns: Group1 and Group2.

This will add a hierarchy to the columns.

Finally, to display the right values on the matrix, you will need to build a calculated measure:

Measure =

SWITCH( Group1, "A", SWITCH( Group2, "Total provisionado", [Total provisionado], "Prov Caja", [Prov Caja], ....)

Hope it helps!