In a sinngle part file, is it possible to give diffrent drafting style to different sheet within single file?
First, I assume you mean in a single drawing file, not part file. And no, you can't set different drafting styles for each sheet. All settings at Tools > Options > Document Properties control all sheets of a single drawing. Settings for individual dimensions, notes, etc. can be over-ridden for specific instances, but not by the sheet.
But assume if my part having A2 & A4 both sizes sheets then how can their dimension , annotation size will be suitable ?
Sorry you can't. Both sheets would pull information/details from the tools > options > document properties. So only option left is as Glenn suggested i.e. manually changing them on one IPD the sheet. You may use a macro for that.
but micro how it will be work ?
The macro will change the annotations font details and other settings on the specified sheet . Thus is something you would do manually but not that macro will create different settings under Document properties.
Retrieving data ...