T4 amendment. Original was not processed through Taxcycle

I’ve to revise/amend previously filed T4 by a predecessor accountant. How this can be achieved without creating all the slips and only sending the amended one?

In the TaxCycle T4 program, I would set up the information for the employer, then create the one T4, selecting Type of Slip as “Amended” and submit.

Done this multiple times without an issue.

So, disregard T4-Summary amounts and just send a T4-amended?

CRA will do their own T4 summary. That is all you have to do.