Selection on a fixed amount basis

Hello, in order to do precise cut by ear, i need to understand in Wavelab how can I do this:

a) select a part of a soundbite
b) create four keyboard shortcuts in order to move on a fix base choosen by me (for example 5ms):

  1. left edge of the selection move to the right at fixed amount of 5ms
  2. left edge of the selection move to the left at fixed amount of 5ms
  3. right edge of the selection move to the right at fixed amount of 5ms
  4. right edge of the selection move to the left at fixed amount of 5ms
  5. loop playback of the selection in order to choose that correct selection
    c) cut the selection between the two edge

Can you let me know how could i obtain this?
It is a way of work i used to do in other mastering softwares, i need to know how to do this in wavelab.

Alessandro, thanks!

Ribbon > Edit > Rangeā€¦ in this dialog you can make selections with many parameters. And you can create presets and associate shortcuts to them.
That should help you.