Hi Andy,
Welcome to this Microsoft Project newsgroup
Jan is on holiday at the moment. Try this: View the Resource Sheet and
double click on the resource name. In the resource Information dialog,
click in the next space in the Resource Availability section and enter the
appropriate details.
You might like to have a look at my series on Microsoft Project in the
TechTrax ezine, particularly #28 minimizing the effect of delays where this
procedure is itemized, at this site:
http://tinyurl.com/2xbhc or this:
http://pubs.logicalexpressions.com/Pub0009/LPMFrame.asp?CMD=ArticleSearch&AUTH=23
(Perhaps you'd care to rate the article before leaving the site,

Thanks.)
FAQs, companion products and other useful Project information can be seen at
this web address:
http://project.mvps.org/faqs.htm
Hope this helps - please let us know how you get on
Mike Glen
MS Project MVP
See
http://tinyurl.com/2xbhc for Project Tutorials