PIpeline - split multiselect and create records from it

I can't seem to wrap my head around this.  I have a record with a multiselect field. When conditions are met, I want a pipeline to take data from the record and create a new record in another table, creating one record for every value in a multi-select field.  I can't seem to figur eout where I would put the jinja to split those values and then loop through them.  Googling came up with the following for the Jinja:

{% set selected_values = a.your_multi_select_field | split(';') %}

But where would I put this? Seems like I need a step after my trigger to do this, but there isn't a "jinja" channel.