[Qgis-user] most efficient way to digitize polygons

[Firstname Lastname]

i am a qgis newby and i am beginning a large project that involves
digitizing several geology maps.  i am trying to determine the best way to
manage the digitizing and avoid extra work.
my question to the group is:  If i have several coloured polygons that are
adjacent to each other, is there an efficient way to digitize one polygon
and then use one edge of that polygon for the adjacent polygon so that i
dont have to redigitize the same edge twice and so that i will have
precisely overrlapping polys with no gaps?  should i digitize one polygon,
export and rename it?  can i digitize one have of the next polygon and
somehow merge it with the now re-imported polygon?
is there a more efficient way to do this?

many thanks

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