feature to merge cache into one new cache

Merge 2 or more caches into one new cache. For example there is a cache that starts at frame 1 to frame 150, another cache starts at frame 151 and ends at frame 250, Then it is merged into a new cache by starting with the first cache (1-150), and continuing with the second cache (151-250). What if the caches have the same start or end point? Overwrite the first cache with the cache below it, For example, the first cache (1-150) and the second cache (100-250), then combined into one by way of overwriting, namely first cache (1-99) followed by second cache (100-250).