Delete 2 custom fields from CustTable in safety

Hi,

I have need to delete two custom (not standard) fields (e.g CustTable.A_Field1, CustTable.A_Field2) from my CustTable in production environment (cus level).

There's been some mess with fields id (these two fields have different id in test environment and prod environment, so i need to delete them from prod and bring the test env. version in prod again)

What's the best way to delete them without corrupting data inside CustTable?

Is there some kind of best practice, check-list to follow?

Thank you in advance

regards