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i would like this
(@expand(@mod(@trend,24)+1)=9 take 1 for 01/05/1973 and 01/05/1974.....etc
(@expand(@mod(@trend,24)+1)=10 take 1 for 16/05/1973 and 01/05/1974...etc
....and so on

That's like saying you would like:
@sqrt(9)=4

What you're describing is mathematically impossible. You can't change the definition of mathematical functions.

Again, I think you need to ask yourself whether the order of the dummy variables really matters or not.

yes, but for the monthly data it make regular dummy:
1973m5 = @month=5 take 1
1973m6= @month=6 take 1
...etc
why for bimonthly not? s=26 it should start from 5th month ( the 1st bimonthly of May)

i hope that you understand me

I understand what you're saying. I'm telling you you are wrong.

i understand the logic of code, many thanks Mr Gareth. :D

How can extract all the dummy as series from the show @expand(@mod(@trend,24)+1).

Don't understand the question.

extract all 24 series dummy from the group g1

Extract in to what?

to use some of them in regression, every time you will use manually @drop(1) to @drop(10) and some others, can i dropping a sequence?
y @expand(@mod(@trend,24)+1, drop(1)............drop(10))
you understood me.

Just use the group. Or if you only want some of them use g1(1) to refer to the first entry in the group etc....

Or if you are only using a couple of them, don't use the @expand at all, but type out the individual expressions in the regression.

Great! :D thanks! Mr Gareth.

(*) EV 9 Users Guide II, page 29. add parenthesis at the end of the code ")".
(**) EV 9 Object Ref, adjust table of contents.
(***) EV 9 Help, Statistical Distribution Functions, adjust the right table for some distribution functions.
:)

What specifically do you see wrong with (***)?