Unfortunately, it is not possible. I would suggest filing this as a suggestion in the Product Ideas section

Not ideal, but as a workaround you could do something like this by having multiple textboxes that each print a single character (by using the SUBSTRING() function to get a specific character from your work order #):

7
3
1
3
7
5

Thank you. Using Text Boxes will not work for this instance but thanks for the suggestion.

I will definitely put in a request to have the option to rotate text!

Until that happens, we will  redesign our label layout to have to make this work.

Hello Sara, 

For additional flexibility building your reports I would check out Acumatica’s ISV partner Minisoft. Minisoft has a forms and label generation tool called eFORMz that would allow you to make these customizations easily. Here is the marketplace listing » eFormz - Marketplace | Acumatica Cloud ERP 

@MirandaDowler52 

Thanks so much for the info!

I will have to check out this option.