MetaStock -> Tools -> Indicator Builder -> New
Copy and paste formulae below.


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Round to nearest decimal or integer
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{ Rounds off data array to nearest specified
  decimal place [+x] or integer [-x].

 ©Copyright 2004~2006 Jose Silva.
  For personal use only.
  http://www.metastocktools.com }

{ Sample Data Array to be rounded }
val:=Mov(C,21,E);

{ User inputs }
x:=Input("Round to nearest  decimal [+x]  or integer [-x]",-10,10,1);
plot:=Input("Data output:  [1]Rounded,  [2]Original",1,2,1);

{ Rounding engine }
rounded:=Int(val*Exp(Log(10)*Int(x))+.5)
 /Exp(Log(10)*Int(x));

{ Plot in own window }
If(plot=1,rounded,val)

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