Invoice Column

Hi…Please advice
1 ) How can i include the 1st column in Invoice page ( to create Serial .Nos )
2 ) In this Invoice page we want include the % column. If inserted this column automatically will calculate the % amount ?

Sorry, but your question is quite vague and it will make it difficult for us to help you.

Which invoice page are you referring to?

How is the % amount intended to be calculated? What is it a percentage of?

See if these Guides answer your questions, @promsmit :
https://www.manager.io/guides/10303
https://www.manager.io/guides/10530