So my question is quiet simple, I know that we can use modifiers to change a spell in a macro while I’m holding it, but I don’t want to hold, I want to change it when I press hold.
Like have a set o spells in my bar1 and when I press shift or control it change for a new set of spells but I keep the hotkeys position. And if I press shift again, it change back to my first set of spells, whiteout the need of keep holding the shift key.
Is that possible?
You could use Action Bar Paging, but that’s more than simply pressing a mod.
Hey Elvenbane, thank you for your answer!
I would do that with an extra addon, with macros or something else?
Just to know what guide I should look for into YouTube or something like that.
It’s not hard for me to learn and apply, just need to know what look for 
By default shift-1 to shift-6 are keybound to switching your main action bar with other action bars that aren’t normally visible. You may have to go into the Options menu to enable the extra action bars and you may want to update the keybindings as well.
Some action bar replacement addons allow more customizations controlling when a bar is visible or not, for example, in combat or not in combat.
Action Bar Paging is part of the default UI (although addons can give you some extra options for it.)
There are 6 action bar “pages” you can access that can replace the main action bar. (These are the original 5 bars plus the “hidden” Action Page 2.) It’s the things you scroll through if you click the little number with arrows next to the main action bar.
As Tinkerrific mentioned, you can set keybinds to swap to a given page in the keybind settings. (So, you’ll have to use something other than modifier keys alone — I usually set the function keys for this.)
You can also set up keys to scroll through them. When scrolling through action bar pages, it will only scroll through ones that aren’t currently on your screen. (You’ll also see this behavior when you click the button next to the main action bar to scroll through them.) So, if you’re showing action bars 1-5, it will only scroll between pages 1 and 2. So, show bars 1-5, put your second set of stuff on Page 2, set a keybind for “Next Action Bar” and that will toggle between page 1 and 2.
It’s a bit confusing as the Action Page numbering doesn’t actually match up with the Action Bar numbers.
In the list below, the Action Page is the number you’ll see next to the main bar showing your action page. The second column is the name you’ll see for a bar in Edit Mode.
Action Page 1 > Action Bar 1 (Main action bar)
Action Page 2 > Only exists as a paging bar
Action Page 3 > Action Bar 4
Action Page 4 > Action Bar 5
Action Page 5 > Action Bar 3
Action Page 6 > Action Bar 2
It all sounds confusing, but if you mess around with it a bit, it will start to make more sense.