Short answer - no.
Unless you add a custom field and type them in manually.
If each window has a different ID (although they are identical windows), the schedule will treat them as unique items and will list them separately.
Only by taking out the ID field will they become identical and then you can merge them and add the custom text field to manually add the IDs.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11