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... the company I am working for wants to upgrade there servers from 5.6 to 5.7. ...
Excellent objective.
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... the company also wants to be able to switch between 5.7 and 5.6 ...
If you mean using the same data file with both 5.6 and 5.7, then - No way.
If they want to run 5.6 and 5.7
in parallel then they can run the different versions on different machines but it's highly unlikely that those machines will want to "talk" to one another. It might be that they have application dependencies that they can't resolve in the short term, so they'd have to run older software on the earlier database version but that's far less than ideal.
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... when i try to install 5.6 It corrupts the tables ...
So, presumably (and
not unexpectedly) the 5.7 upgrade made changes to the data file format that 5.6 knows nothing about.
There is
nothing that you can do about this.
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... ive gone into mysql and tried to format the tables ...
If the data file format has changed between versions, then there is
no way to get the older version to read the newer format files.
I assume you still have their "real", 5.6 server machines up and running.
Build new server machines and install 5.7 on them.
Then go back to the company and find out what they actually want to
achieve, because flip-flopping between versions of database software is simply not possible.
Regards, Phill W.