Constants are data sources with a fixed value. Their value is not calculated while a process is running, but is defined by the user when creating a data flow.
Copy a constant and paste it in the relevant location in your data flow.
Procedure
In the data flow, right-click the constant you want to copy, and click Copy.
Right-click at the position in the background of the data flow where you want to place the copied constant.
A Paste icon appears. Click in the data flow background.
You have copied a variable.
Tip
You can select a constant in the data flow and press Ctrl + C. Then, press Ctrl + V and place the copied constant at the relevant position.