Hello Abhijeet,
To get the details about the Sales Order, standard SAP report is available which can be accessed by T-code VA05N (old t-code VA05). Here, you can pass the Customer Code (Sold To Party) in the selection screen and get the list of Orders.
You may further bifurcate the data by selecting the radio button available at the bottom to view only the open Sales Order or All Sales Order depending on your requirement.
Rewards if useful.
Thanks & Regards,
Md Faiz Abbas.