Hi Asitabha,
If the Sales order line in question is numbered, you could potentially use Surface Automations 'Region' mode to find the line you require and then use a global mouse click to select it.
More information on Surface Automation can be found here -
How do I find information on Surface Automation?I hope this helps!
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John Pass
Senior Customer Support Analyst
Blue Prism
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John Pass
Customer Support Analyst
Blue Prism