Duplicate flow data from one period to the next

Dear community,
I want to duplicate the data for flows from one period to the following ones, but I can't find the corresponding function. Entering everything by hand would be very laborious because the system is large. I appreciate your help very much.
Best, Raoul

In the Data Explorer,
(1) Select the data sets of the period you want to copy by clicking the blue box in front of the first row, keeping the mouse button pressed, and moving it to the last row.
(2) Press CTRL+c to copy the data to the clipboard.
(3) Repeat the selection procedure for the data sets of the period where you want to insert the data.
(4) Press CTRL+v to paste the copied data into the selected area.