I have run into this as well, especially if you have data in the table, that limits what you can change. I looked at the API and it only allows delete of table and delete of row, not column. If you have data in it, best is to use the API to export the rows, create a new table, then use API to PUT the rows into the new table.
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Robert Wakefield-Carl
Avtex Solutions, LLC
Contact Center Innovation Architect
robertwc@avtex.comhttps://www.Avtex.comhttps://RobertWC.Blogspot.com------------------------------