There may be something simpler and quicker, but this works:
Let's say you have 5 stories as epubs.
Using copies, change the file extensions of stories 2-5 to 'zip'.
Unpack each one.
Load story 1 into Sigil.
Right click a folder in the left hand side panel and choose Add existing items...
Navigate to the unpacked other stories and select all the Text items within the Text folder.
Repeat for each story. (You may need to modify filenames to differentiate between stories.)
If there are images and/or different stylesheets repeat for those.
In Sigil do any rearranging necessary then save.
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