What are the different possible methods of sales order creation? Kindly mention all possible methods

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What are the different possible methods of sales order creation? Kindly mention all possible methods - including user interface and excel based (like ADFDI or visual builder)

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For my client who is doing order entry through third party applications, trying to recommend Oracle Cloud Order Management. But their current order entry is simple.

Trying to find the simplest way of sales order entry in Cloud

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