7za help lists the following switches for including/excluding files in the archive:
-ai[r[-|0]]{@listfile|!wildcard}: Include archives
-ax[r[-|0]]{@listfile|!wildcard}: eXclude archives
Suppose I want to pack My Directory to MyArchive.zip excluding subdirectory Irrelevant.
I tried the following
7za -ax"My Directory/Irrelevant" -tzip MyArchive.zip "My Directory"
7za a -x"My Directory/Irrelevant" -tzip MyArchive.zip "My Directory"
7za a -x@"My Directory/Irrelevant" -tzip MyArchive.zip "My Directory"
7za a -x"@My Directory/Irrelevant" -tzip MyArchive.zip "My Directory"
7za a -x"Irrelevant" -tzip MyArchive.zip "My Directory"
Neither of those is recognised.