Hola.

I am totally sure, as an accountant, that in the Spanish it's a common practice to mention the total amount as "importe" and what we find in the invoice description as "concepto".

So, it is 100% confidence sure that importe will be the total amount that comes as a breakdown later (importe conciliación, importe impuestos, etc.)

Now, if you want to translate "concepto" you have to give the best approach to this specific case because there isn´t a 100% match in English, there are some options like the "Goods/services provided", "details", "items", etc.) depending on what is the nature of trade.

I don´t have enough information here, but in general terms I would go for "products/services" or "goods/services".

I hope this helps you.