Change custom property by importing a list

Smart CRM & Sales Hub CRM
1

I am new to HubSpot and just testing importing lists. I created a custom property and imported a list to put a value in that property for 1 contact. I then removed the value from that field in my list for that contact and imported it again. I expected that the property for that contact to change to being ‘blank’ instead of having the original value. It did not however. Am I missing something or does importing a list NOT change the value of a custom propoerty to ‘blank’ once there is already a value in there? Does this have to been done manually or via an API?

Thank you.

2

It has to have a value in it for it to “override” the existing data. Easiest way is to change the data to a space or use “Unknown” or “N/A” if you want the field to be blank after your import. It’s super helpful though if you are uploading data and you don’t want to lose what’s already in there.

3

Thank you. Do you update your contacts with an API or through using lists?

4

We import via lists at this point.

5

Ok. We are going to be doing that as well.