When having lots of colorways, there are different ways to organize and search colorways and one of them is the grouping of colorways. You can select one of the default groups 1-9 for every colorway.
Select one colorway and from the Edit menu > Group you can select/deselect the group.
This will apply the group number and color to the colorway.
Working with neoTextil and colorways groups, the colorway will be synchronized between neoCatalog and nT Colorations.
Related articles:
Grouping of Colorways in nT Coloration