Automation: Update Record to link to multiple records instead of overwriting

Just check if there is a value in the original linked record field first. If there isn’t a value already, the comma might cause problems. You can use a condition in the automation to check for the existence of prior linked records.

Great catch! What I wrote above would ONLY work if there was already a pre-existing value. So be sure to use conditions to trap for both situations (pre-existing value & no pre-existing value).

Thank you both for your help. That did it!

For posterity and other non-coders out there, i had to add Field B, one comma, and Field B, with NO SPACES between the comma and the fields. and i created two versions of the same action, one with the condition that Field B is NOT empty and one with the condition that Field B IS empty.

PS: it would be great if Airtable prompted some of this coding help, particularly for those of us who use Airtable specifically because we aren’t coders. it could just be part of the help text for this kind of field when building automations.

The techniques in this thread still work the same. 

But you have to know the fields that are involved. If you cannot find them, you may have the wrong table.

I will find it eventually .. Thank you for confirming
If I may ask another one: can we perform math operations in the Create Record fields in an automation ?
For example add two fields with numbers in one of the cells. I can see both numbers I need to use in this case 🙂

Airtable automations do not have native support for math operations. You can use a script to perform math, or you might be able to use a formula field to perform the math.