Hi,
You can import the exported CSV file via the menu Products->Import in HikaShop.
I can see that your would CSV file has been corrupted in some way. The double quotes are doubled.
You will have to open your CSV with notepad++ and do a search&replace on "" to replace it with "
Then it should work better when importing the file.
What do you mean by the file look "funny" ?
HikaShop never delete a product. However, if you have a product already in the database and that you have it in the CSV, its information will be updated.
That way, you could remove the product from all the categories for example. The problem would look like it disappeared even though it is just not assigned to any category.
Also, for your first point, that means that your CSV is not valid.
You can export only some products by selecting them in the products listing with the checkboxes available and then by clicking on export.