You can't call macro functions. But you can use variables. You can put expressions or part of expressions in variables and use the variables in other expressions. And you can pass parameters to variables. In the example below var1 accepts one parameter. In var3 the parameter passed to var1 is var2.
var1: sum( $1 Sales)
var2: {<Year={2014}>}
var3: $(vVar1( $(var2) )) * 1.05
Using this you can construct complicated expressions by defining parts as variables and (re)use the variables where ever you need that expression or expression fragment.
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