[amibroker] Formula Call Feature?

[Dennis Lipter]

Is there a  "formula call" feature that references a previously written custom 
formula in a new formula?

Say I have written "Formula x" and I want to include it in a new formula called 
"Formula y". 

Like this simple example:

Formula x :
      a=IIf(C,(H+L+C)/3,(H+L)/2);

      Plot(EMA(a,5), "Formula x"colorOrange); 


Formula y = "Formula x" +2

Thanks