I need a routine for import of child records to Contacts.  Custom fields for Custom Object and Contact have been created, and are config as External ID.  Import wizard only permits one child per parent and views any additional records as duplicates :(

Workflow/Validation rule won't work, as the field to update is LookUp to Contact.

Can I initiate a process from a view, to look up contact id based on matching values in the custom field?
IF (CustomObject__c.CustomField__c = Contact__r.CustomField__c) TRUE place Contact.ID in lookup field, FALSE leave generic contact ID inplace)
 

I need a routine for import of child records to Contacts.  Custom fields for Custom Object and Contact have been created, and are config as External ID.  Import wizard only permits one child per parent and views any additional records as duplicates :(

Workflow/Validation rule won't work, as the field to update is LookUp to Contact.

Can I initiate a process from a view, to look up contact id based on matching values in the custom field?
IF (CustomObject__c.CustomField__c = Contact__r.CustomField__c) TRUE place Contact.ID in lookup field, FALSE leave generic contact ID inplace)
 

I need a routine for import of child records to Contacts.  Custom fields for Custom Object and Contact have been created, and are config as External ID.  Import wizard only permits one child per parent and views any additional records as duplicates :(

Workflow/Validation rule won't work, as the field to update is LookUp to Contact.

Can I initiate a process from a view, to look up contact id based on matching values in the custom field?
IF (CustomObject__c.CustomField__c = Contact__r.CustomField__c) TRUE place Contact.ID in lookup field, FALSE leave generic contact ID inplace)