To copy columns from the skills and standards tabs, you must do a mouse right-click (long click in the Apps) on the header of the column that you want to copy, even if it is the average one, and in the menu that is shown you must select the Copy option.
After copying the column you should select any other tab of the group and perform the same operation on the header of one of the columns to Paste the copy you have made.
When performing the Paste action, a new column will be inserted with the numeric values you had in the original column, which you can edit, add in a formula, etc.
This action of copy/paste the columns of skills and standards is very useful to preserve the marks of previous quarters.
NOTE: You can paste the columns only within the same group where you have the skills and standards that you have copied.