Hi @PytByt ,
Do you want to make selection in a drop down, navigete to the related secreen, in that screen a lable displays the related value and two navigate button?
Firstly, I suggest you set the label's Text to the value directly, not drop down.selected.value because there are two ways to navigate screen (choose selection in drop down and navigate button). If you navigate screen by clicking navigate button, drop down.selected.value will not change.
I've made a similar test for your reference:
1)add 4 screens named Screen1,Screen2,Screen3,Screen4
2)in screen1
set the drop down's Items:
tablename.fieldname //replace with your tablename and fieldname
set te drop down's OnChange:
If(Dropdown1.Selected.Value="or1",Navigate(Screen1,None),
Dropdown1.Selected.Value="or2",Navigate(Screen2,None),
Dropdown1.Selected.Value="or3",Navigate(Screen3,None),
Dropdown1.Selected.Value="or4",Navigate(Screen4,None))
set the label's Text:
"or1" //on your side, you could set to "OR1-1-1"
set the navigate's OnSelect:
Navigate(Screen2,None)
3)in screen2
set the label's Text:
"or2" //on your side, you could set to "OR1-1-2"
set the navigate1's OnSelect:
Navigate(Screen1,None)
set the navigate2's OnSelect:
Navigate(Screen3,None)

3)in screen3
set the label's Text:
"or3" //on your side, you could set to "OR1-1-3"
set the navigate1's OnSelect:
Navigate(Screen2,None)
set the navigate2's OnSelect:
Navigate(Screen4,None)

3)in screen4
set the label's Text:
"or4" //on your side, you could set to "OR1-1-4"
set the navigate's OnSelect:
Navigate(Screen3,None)

Best regards,