@krishnakhanna Solution provided by Tomasz is probably the best in most cases, but alternatively if you don't want to rename your Symbols permanently (for any reasons), you can just change Stock's Name/FullName dispalyed in the Title in any way you want. Of course it is not the perfect solution, but it has some advantages. In the example below, stock's FullName is CDPROJEKT (Name - CDR), but in the title there is only PROJEKT:
It is also worth noting, that when using Symbols search window, the stock is found even when you provide only the middle part of the stock's Name or FullName. So in your case you don't have to use the prefix "NSE/" to find and display your stock.
You can try this code (instead of the AmiBroker's default Basic Charts --> Price or other similar ones):
_SECTION_BEGIN("Custom Name + Price");
Version (5.90);
CustomName = StrMid( FullName() /*Or Name()*/, 4); // or CustomName = StrReplace( FullName(), "NSE/", "");
SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = CustomName + StrFormat( " - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ));
Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() );
_SECTION_END();