The layer table allows you to directly enter parameter values for the layer model. You can instead manipulate the profile graphically.
Click on a cell to edit the value. Press Escape to restore the value to how it was before you started editting. Press the up and down arrows to go up and down the rows, or tab and backtab to change between columns.
Copy and paste should work in the cells using your usual copy and paste keys. Alternatively, you can also enter the name of a parameter. E.g., qc1 for the the Qc^2 value from layer 1. In reflfit, you will need to prepend this with the section t, m or b.