QB Issue Resolution:

If you are keeping inventory, that is held as an asset and purchases will not show on the P&L.  Run supplier purchase report for the date range you want

inbound shipping is part of inventory item cost, so when you get the bill you adjust the total cost of each item by a portion of the shipping.

Resolution for Issue 'Purchase and landing cost expense tracking. How can I see in the P&L account, that how much I spend for purchases in a specific period? and how can book the lading cost?' available: Yes (Solved).
Source: Intuit Community forum.

Purchase and landing cost expense tracking. How can I see in the P&L account, that how much I spend for purchases in a specific period? and how can book the lading cost?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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