Start as follows:
Go to the article center.
Press in front of the article to go to the content part overview in the case you do not already see the CP overview.
Choose now the CP that you want to copy. Behind the CP you can find the following symbol . By pressing this symbol you will mark this CP to copy it. After pressing the symbol it changes to and the line gets marked with an orange bar that also shows that the CP is marked for a copy action. (Image 1)