is there a mapping technique that would allow the suppression of output in a transform?

I would like to perform a test on an input value and then make a determination as to whether to completely suppress the record/segment output or not

thanks for the advise

There is a filter tab available on the output tag properties. You can set some conditional logic here so if it returns true you define the action as ‘show’ or ‘hide’.

Is this Data Migrator or Services Manager? If this is Data Migrator, and if what Pete Webster suggests does not work for you, try doing a source transformation that will set a flag based on your 'test', then you can filter on that 'flag'.

This is possible - In transformation workbench you can set the properties of the Parent tag to suppress/hide the attributes or child tags if a condition is met. It is on the first tab of the element properties window.