A style in a given colorway can be sourced from 2 two different countries. "In-store date" for the colorway from both sources will remain same but due to change in transit days, Calendar milestone dates will be different in both cases.
In OOTB, we can track calendar milstones only at Colorway level (including Dashboards).
This scenario is quite common in retail industries with most customers want an ability to track Colorway-Sourcing rather then just colorway.
So, i would request to have an ability to track Colorway-Sourcing using Calendar/Workflows and Seasonal Dashboard.