Not 100 % sure, but are you asking for a way to adjust your markers to so they align with the changes in Tempo in your project?
Try looking a the Marker View and just relocate the maker for the location you want.
"Marker View
Open the Markers view with the Views > Markers command, or by pressing ALT+SHIFT+4. The Markers view lets you add, move, rename, or delete Marker (labels) for places in your song. The markers make it easier to move from one point to another."
Cakewalk Documentation