Very easy tweak but this will save loads of your time. One of the most important asks by Salespeople is perhaps this – “Add multiple Products on Opportunity at once!“
Here’s how you can do this –
Classic Experience
In current/classic experience, if you open Opportunity Lines and go on to add a Product as below – 
It’ll either open in a New form.
This isn’t intuitive. You definitely…
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Add multiple Opportunity Products at once in Dynamics 365 Sales | Enhanced Experience [Preview] – D365 Demystified
Here’s how you can quickly add Products to an Opportunity in Opportunity Product in Dynamics 365 Sales
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