How do you branch and merge with TortoiseSVN?
SvnTortoisesvnBranchBranching and-MergingSvn Problem Overview
How do you branch and merge with Apache Subversion using the TortoiseSVN client?
Svn Solutions
Solution 1 - Svn
My easy click-by-click instructions (specific to TortoiseSVN) are in Stack Overflow question What is the simplest way to do branching and merging using TortoiseSVN?.
Solution 2 - Svn
Version Control with Subversion
A very good resource for source control in general. Not really TortoiseSVN specific, though.
Solution 3 - Svn
You can also try Version Control for the Standalone Programmer - Part 1 or perhaps Merging with TortoiseSVN.