Hi thomsen01,
Maybe you are thinking of like a drop-down setting at a cell in a spreadsheet. Although there is no exactly
the same mechanism currently in Origin, but you can mimic it by the label button which triggers a script,
which contains a GetN command to open a selection dialog box.
(See https://www.originlab.com/doc/LabTalk/ref/getnumber-cmd )
For example, see the sample below:

Here, you can select a cell in a worksheet, press "My Choice of Color" button. Then, the drop-down
dialog appears, and when you click OK, the selected color is entered to the current cell.
The script behind the button is the following simple 4-line code:range rcol=wcol(selc1); //Current column of the cell
string colorlist$="Red Green Blue Purple"; //List of choices
getN (My favorite color is:) ii:colorlist$; //Open the dialog box
rcol[selr1]$=token(colorlist$,ii)$; //Assign the value to the cell
You set this script as to be triggered by "Button Up" in the Text Object dialog. See the details at:
https://www.originlab.com/doc/LabTalk/guide/From-Graphical-objs
Hope this helps.
--Hideo Fujii
OriginLab