Help with converting number to negative based on another column value.

Hi All,

I am new to this so my question could be very basic. I am trying to create a new custom column to display the numbers from a column named "actual amount" in either negative or positive values, based on a value "Outgoing" from a column called "payment direction.

How can I do that, please? I have ssen other topics about this but I can't seem to get this to work for me. Thanks.