Fill in Excel worksheet with data from 4 separate text files

I have an Opencart 2.x website for selling books and I need to create a comprehensive category structure. The good news is that this doesn't have to be done manually as Opencart has an export/import tool and this means I can import all categories in one single operation from a Microsoft Excel spreadsheet. Therefore I need a freelancer to take the data from these 4 text files and put it into the attached Excel spreadsheet. The data (in the text files) is delimited by commas and will need formatting before being imported into Excel. Additionally, the freelancer will need to fill the other columns within the spreadsheet such as the category id, parent category id, sort order and the SEO keyword for that category. I have already entered a number of categories manually into this Opencart then exported as an Excel spreadsheet which is attached. Please inspect so you can understand. To have a better understanding of the category structure, the website has 4 top-level categories: - Business, Technical and Professional - Children's - Fiction - Non-Fiction Each of the above top-level categories have sub-categories so for example, "Business, Technical and Professional" has 7 sub-categories: - Business and Economics - Computers - Education - Law - Medical - Psychology - Technology Then each of the above also has their own sub-categories so there are 3 levels. For example, "Business, Technical and Professional" has the sub-category "Business and Economics" which in turn has the sub-category "Accounting". This gives you the following: Business, Technical and Professional > Business and Economics > Accounting Notes - Most of the bottom level categories in the text files start with a category called "General". Instead, I want the category structure purely alphabetical. Finally before mindlessly bidding for this project, please do actually open up the zip file and look at the contents.