HI,

I have one question,

Where we have increase the size of the calculated column in cube...

whether in attribute  or some where else...

Priya,  Are you asking about the format of calculated measure in the cube? If I am not wrong, calculated columns in the cube will not have any size. 

Yes..

i am asking about the format of calculated measure. only..

Hi Priya.N,

If you want to format the calculated measure, you can specify the format_string property when creating the calculated measure. After you deploy the your cube, you can set the FormatString in Property grid. 

Reference:
http://www.purplefrogsystems.com/blog/2011/01/how-to-add-calculations-in-ssas-cubes/

Regards,