How to Import Multiple Values in custom field

The granularity of data in your example suggests that custom field (more so one with multiple values) would be wrong choice in first place.

Think about it like this:

  • only one dog might weight precisely 35.5kg — that is type of data appropriate for custom field
  • multiple dogs (or dog breeds) might be of medium weight — that is type of data appropriate for custom taxonomy

In either case it is preferable to handle task like this through WP API, rather than import via MySQL. 40K records is very reasonable, and your data doesn’t seem problematic to process.

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