[Not a question] Combine multiple xml files into a single file based on parameters

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XML

jQuery

I am hoping someone has dealt with this issue and can get me started. I have a client that sends me an xml file with every job that they have in their system every Thursday. I have a java program that parses this file and creates a single xml file for each of the jobs. This is running between 40 and 50 each week. I am currently opening those files manually and creating a new xml file with approximately 8 jobs in it. This subset is what I need to process into my system. My question is can I programmatically do what I am doing manually which is selecting a series of files based on their job number (which is also the file name) and concatenating them together into a new xml that I can use to import. The current process is manual mostly because the job numbers will change every week. I can create a file with these job numbers in it or a table or something else if that is an necessity. I just want to move this from a completely manual process into at least a semi automated process. The hard part for me is that this is being done at midnight each week, so if I can automate the process I can get to bed faster.

I have used several snippets of code from this site in the past and have found this to be one of my favorites for solving my coding dilemmas. I have a beginner to intermediate coder who is always looking to improve. Thanks in advance for any help.