You can export a CSV file with your inventory from Mana Pool.

Some sellers have a workflow to update prices and quantities using an import/export loop as described below.

Export -> Import Loop

How to Edit Prices & Quantities

1. Go to manapool.com/seller/inventory
2. Click Export listings, and select Mana Pool format
3. Open the exported file in the editor of your choice
4. Edit the prices and quantities, and save the file.
5. Return to manapool.com/seller/inventory and click Import to select the edited file.

How to Edit Conditions

If you want to update conditions using an import/export loop, you need to do your loop using the ManaBox format (see this article). You can't use the Mana Pool format to edit conditions.