Use parametres slicer on calculated columns

Good morning, everyone,

I would need to create dynamic reports (in order to simulate context changes). To do this I thought to use the parameters that, however, once set, do not allow me to get any output. I try to clarify with a brief example:

• I would like to apply, in value, the discount to the calculated column "Sales price" (calculated because it depends on n parameters that determine the output). The report is already created, with all the necessary visualization so I simply set the parameter and completed the formula of the column calculated "Sales price" (subtraction of the parameter). Moving the parameter I do not get any result, any variation of the column "Sales price". The parameter should be set correctly because creating a new display the measure of the parameter varies according to the value that is inserted.

Isn't it possible to use the parameter as a variable x on one or more calculated columns?

Thank you