You will have to use a script task or a file system task to create the folder. The name and path of the folder can be derived from a variable / variable with expression.
Likewise, the Excel dest would have to have a variable as a connection string to point to the new file.
Look at Variables and expressions in BOL.
Cheers,CrispinI can't die, there are too many people who still have to meet me!It's not a bug, SQL just misunderstood me!