Why I can't find subtotal option of values in Matrix, powerBI?

[peilin_yuan]

why no item "Sum" in the red square?

Why I can't find "sum" in the value of Matrix tool? Should I make a new coulumn or new measure to produce Sum? 

Thank you so much for your hints!!

How to find out sum in the  red square? Please help me out !

[peilin_yuan]

It's data type problem. Thank you !!

[ValtteriN · Accepted solution]

Hi,

Have you checked that your data type is integer (whole number, decimal number or fixed decimal number)?

Here are the summarization options when my example data type is text:

After I changed the data type 

I get the following options:

I hope this helps to solve your issue and if it does kindly accept this as a solution and consider giving it a thumbs up!