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Someone sells software used to keep track of rentals. Now, the proper category would be /Computers/Software/Industry-Specific/ - and some competitors are there. However, that category is closed.
No subcategory fits exactly. Most of the customers are in the construction business, which has a subcategory, but the software is can be used for other rentals as well, such as audio/video, party, etc, etc.
What should he do? Is there a way to get the submission accepted for the root category? Or should he just submit to Construction? Or is there a way to submit to every category for which the software is relevant?
If you get no response after a week, go up again.
There is probably no harm in submitting the site once to the parent category as well. Though spamming across all semi-relevant categories will lead to problems.
Your friend might suggest a new category or find something close. Unfortunately there is not an exact category match for every site out there.
The fact that you can't find a suitable subcat below Industry-Specific could really mean that your software actually isn't specific to any single industry ;) . Maybe you want to have a look at /Computers/Software/Business/, and consider if getting listed in that area would be an acceptable alternative.