Here is a short snip from a document I made for myself after a few weeks of figuring things out.
Tomcat uses server.xml to load up contexts. A context in simplest terms, is that which appears after
http://localhost:8080/ By default, Tomcat will create a context with the same name as each of the folders under the webapps directory. So if you want to group together a "JSP application" under
http://localhost:8080/mySite then place the mySite folder inside of webapps, and Tomcat will create this context for you. If your folder is somewhere else on the hard drive, you can still have Tomcat load it, but you must specify it in server.xml
Partial listing of server.xml...
NOTE: It is very important to place Context statements within the appropriate XML tags. You must place a new <Context> tag within the <ContextManager> tag.
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.
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<Context path="/mySite"
docBase="C:\aFolder\someFolder\myFolder"
debug="0"
reloadable="true">
</Context>
Hopefully you can manage to understand how to modify this file.