Reference Numbers vs. Tags vs. Customers

Last updated: March 26, 2026

In order to make shipment tracking data useful for your operations, you'll want to tie your internal data to the shipments you're tracking in Terminal49. Examples of internal data include:

  • Purchase Order numbers

  • SKUs

  • Suppliers

  • Vendors

  • Team and/or team member responsible for shipment

  • Customers

Choosing the Right Field: Tags, Reference Numbers, or Customers

Use the table below to decide which field best fits your data:

Field

Best For

Key Details

Tags

Grouping multiple shipments together (sort, filter, or group by supplier, team, SKU, etc.)

Applied at the shipment level, not to individual containers; multiple tags per shipment allowed; can be updated at any time

Reference Numbers

Unique identifiers for a shipment or container (e.g., a Purchase Order number)

Can be applied to individual containers; multiple reference numbers per shipment allowed

Customer

Sharing a list of shipments or containers with an external party (customer or vendor)

Allows you to create a custom view that outside partners can see

Tags

If something applies to multiple shipments, you'll want to submit that as a Tag. Tags are a way to sort/filter/group multiple shipments together.

  • You can associate multiple tags with a shipment (tags are applied at the shipment level, not to individual containers)

  • You can update tags on a shipment at any time. Here is how.

Reference Numbers

Reference Numbers are meant to be unique to the shipment (e.g. a Purchase Order number). You can associate multiple reference numbers with a shipment.

To add reference numbers to individual containers:

  1. Hover over the container number on the shipment page.

  2. Click Edit.

  3. Add the reference number.

  4. Click Save.

Note: If you need container-specific identifiers, use reference numbers rather than tags, as tags apply to the entire shipment.

Customer

In order to share a list of shipments/containers with an external party, like a customer or vendor, you should submit that info in the Customer field instead. That will allow you to create a custom view that your outside partners are able to see.

Frequently Asked Questions

Should I use a tag or a reference number for my Purchase Order number?

Use a Reference Number. Purchase Order numbers are typically unique to a specific shipment or container, making them a better fit for reference numbers. Tags are best for values that apply to multiple shipments (e.g., a supplier name or team name).

Can I apply a tag to just one container within a shipment?

No. Tags are applied at the shipment level, not to individual containers. If you need a container-specific identifier, use a reference number instead.

How do I give a customer or vendor access to view specific shipments?

Use the Customer field on a shipment. This allows you to create a custom view that your external partners can see.

See next article: How To Add/Edit Shipments Tags

If you need help adding your internal data into Terminal49 or have any other questions, the fastest way to get assistance is through our in-app chat. You can also reach us at support@terminal49.com.