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You can learn how to pick for each picking requests here. You can either pick by each order, or Batch Picking them to optimize picking process with a large volume of orders.
How to pick a picking request
First, you - as a warehouse manager - have to assign pickers to picking requests. How to assign picker to a picking request
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{How do I edit a picking request in “Picking” status?}
How to Batch Picking picking requests
Or in case that you wants to optimize the picking process in your warehouse, please have a look with {How to Batch Picking the picking requests }
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