Level Metric Formulas

When creating a level metric on the fly (Derived metric inside a report), there is some syntax you need to know for the different grouping and filtering options.
The table bellow shows the different options:

Symbol	Definition
Metric Level target
~	Report Level
[Attribute Name]	Target
Symbols placed before the target
No symbol	Grouping = Standard
!	Grouping = None
<|	Grouping = Beginning fact
>|	Grouping = Ending fact
<	Grouping = Beginning lookup
>	Grouping = Ending lookup
Symbols placed after the target
+	Filtering = Standard
*	Filtering = Absolute
%	Filtering = Ignore
No symbol	Filtering = None

The above means that, if you need to create a dynamic level metric, it would look like this:
Sum([Metric]) {~}
or
Sum([Metric]) {[Year]}
or
Sum([Metric]) {![Year]*}

I got these definitions from Raja Vel on his blog: http://microstrategytechbuzz.blogspot.com/2013/04/tip-metric-level-property-symbols.html