First of all, to be able to transfer hours from the previous schedule to the next, there must be overtime to import. The values are only copied if the earlier schedule ends before the next one starts, in other words when there is continuity between them.
From the Work time side panel go to the Reports section, then select Schedule execution and with the selected schedule click Schedule execution report.
In the upper right corner, click Import overtime.
If overtime is imported, a message will appear on a green background.
If there are no hours to import, you’ll also receive a message.