Clearing/removing just one option from a HubSpot Multi-Select field is especially needed since tags aren’t supported in HubSpot (which we need).
We instead need to use fields to add/remove values to trigger automations. Otherwise presently since we can’t update (turn on/off) values from a multiple checkbox property then we need to create a whole new field every time we need to trigger an automation.
BTW this capability is available using Zapier but not inherently available within HubSpot.
Similar requests:
https://community.hubspot.com/t5/Reporting-Analytics/Update-multicheckbox-property/m-p/383192