Here is a list of supported Liquid fields in Techship MH10 Labels - 


shipment.lines

order.ship_to_name

order.ship_to_company

carrier_settings.sender_company

carrier_settings.sender_address1

carrier_settings.sender_address2

carrier_settings.city

carrier_settings.state

carrier_settings.zip


shipto | zpl_escape

order.addresses

order.city

order.state

order.zip

order.additional_wms_data.WmsBillOfLading

order.additional_wms_data.DCNumber

shipment.customer_sku

order.customer_po

order.customer_order

shipment.warehouse_sku

line.description

order.additional_wms_data.CUSTOM_WmsUpc

shipment.sscc


Accessing PO in store for References:

mapper_order_references.qualifier