help in tradestion formula

[magiclaas]

hi,
I use tradestation on a metastock eod database but I have no experience in easylangage format

I ask how to write in the easylanguage formula a spread between two symbols

x example: advancedecline line

I got the formula:

inputs: AdvIssues( Close of data1 ), DecIssues( Close of data2 ) ;

Plot1( AdvanceDeclineDiff( AdvIssues, DecIssues ), "A/DLine" ) ;

I ve advance stocks data in folder
c:\ bullbears\index\ adv
and decline stocks data in folder
c:\ bullbears\index\ decl

how to create the advancedeline indicator?
thank you very much
L