Track View > Dope Sheet > Specify a time block. > Time menu > Copy
Track View > Dope Sheet > Specify a time block. > Time: Dope Sheet toolbar > Copy Time button
Use Copy Time to copy a block of time from one or more tracks to the clipboard, after which you can paste it to other tracks.
You can use the clipboard to copy time, with keys, to different places in the same track or from one track to another. For example, you can copy position keys from one object to another.
To copy time from tracks:
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In Dope Sheet mode, highlight one or more item labels in the Controller window to specify tracks for time editing.
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Use Select Time to specify a block of time.
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Click Copy Time, or choose Time menu > Copy.
The block of time is copied to the time clipboard. The original block remains unchanged.