Saving data from a list

Is the appropriate WF for saving data from a list to schedule an API workflow.
for example…I want to save availability for a user (days of the week as well as hours available for those days) for their clients to be able to book with them. I’ve tried creating a RG with an input to show the days available however, there is no way (as far as I know) to save the chosen options to the DB.

Can someone shed some light please?..I’m stuck.