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Anjali MalhotraAnjali Malhotra 

Can I show the sumtotal value of all the closed Won Opportunity in account page

Waqar Hussain SFWaqar Hussain SF
Yes, Create a Roll-up Summary field on Account as below

Summarized Object = Opportunities
Select Roll-Up Type = SUM
Field to Aggregate = Amount

then check the radio button Only records meeting certain criteria should be included in the calculation

In the criteria add
Stage                       Equals                Closed Won
 
SandhyaSandhya (Salesforce Developers) 
Hi,

Create a Roll-up Summary field on the Account object that calculates the SUM of all related Opportunities where Stage = "Closed/Won." Field to aggregate as Amount and Type as SUM

https://success.salesforce.com/answers?id=90630000000h0kBAAQ
 
Please mark it as solved if my reply was helpful, it will make it available
for others as a proper solution.

Best Regards,
​Sandhya