Supressing Dimension Values in A Pivot

[#1]

HI,

Im using a 'Select In Field' Action to filter a report.

Ive attached a screen layout of what I need to acheive.  Im setting  the  'Indicator'  field but there are some 'Main' values that I need to omit from 'Indicator A'.

Is this possible?

Many thanks for your help.

Fiorano