I think it would be more efficient and time-saving if you use the Excel sheet to keep track of things, instead of counting the amount with your eyes.
ご質問ありがとうございます。
"I think it would be more efficient and time-saving"=「もっと効率的で時間を節約できると思う」
"if you use the Excel sheet to keep track of things,"=「エクセルシートを使って記録を付ければ、」
"instead of counting the amount with your eyes."=「目で額を数えるよりも。」
ご参考までに。