Is there only the 4th tier of items here?
No, there are all tiers and subtiers at once. Determine by colors. Horizontal tiers: blue - 4, red - 5, orange - 6. Vertical subtiers: without stroke - 0, with green stroke - 1 etc.
How to send prices to different servers?
Launch the client with a flag and a list of the necessary servers. The data will be sent to them. To switch the data source in the calculator, use the select in the header.