Edit- In editing my graphic to fix what Vic pointed out, I realized I didn’t even correctly understand what you wanted to accomplish, 
but now maybe I do. 
To get you started.
Cubase does not have the command you mentioned, you would just enter the range within which you want to select notes. I changed the image I uploaded so it would do what you are asking. Note the values in the parameter columns.
When you want to edit velocity, change the Function to Transform, and the action in the lower pane will take place. In this example it would subtract 20 from the velocity of the notes determined by the filter in the upper pane.
