I have a naming convention that I use so that I can easily identify custom code that I created vs code that came from Splendid. I am guessing that you need to change the name of the proc or update vwSqlProcedures to include the new procedure. Then hit the _code/Procedures.aspx. Copy the generated text into SqlProcs.cs
The trick we use is to use Windows Explorer to give Everyone Modify access ot the SqlProcs.cs file, and then the Procedues.aspx will directly overwrite the file. This saves you the effort of cut-and-paste.