New key field creation in between of the 2 existing key fields?

Hello,
I have a custom table with 3 key fields.
Now because of business requirements, we need to add one more key field IN BETWEEN the 2nd key field and 3rd key field of that table, if we create a new key field in the middle of existing 2 key fields, do we loose the data in the table, pls. let me know.
And also do we need to take any precautionary steps to go smoothly?
Thank you

Think about it logically, if you add a key field, how would you lose data, since the primary key is now longer than before? Only if you remove key fields, you might lose data during table adjustment due to duplicate primary keys.
Make sure all other field names remain unchanged.
Try it in dev system first, check the results. For even more confidence, why not download the data first as a backup, "just in case".
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