[Qgis-user] polygon fills from different shapefiles

[Firstname Lastname]

i have four different geologic maps that i have imported as shapefiles.
The files have filled polygons that have the name of the geologic formation
in the attribute tables.  i would like to have a common colour for each
polygon of identical age/name for all the map sheets.  Each map sheet has a
similar list of formations, but some of the formations are different for
each map sheet.
What is the most efficient way to make the identically named polygons
displayed with the same colour?  Should i add a column in each attribute
table and put a formation code in for each one manually or can i add an RGB
colour for each formation in the attribute table? or, do i need to
categorize and  classify these in the layer properties table after i have
added formation code in the attribute table?
i hope that my question is clear.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
byron at conjugategeo.com
Cell:4037108414
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