How to create optional parameters in discoverer 10.1.2

I am new to discoverer, Can any one tell me how to create optional parameters in Discoverer desktop edition in 10.1.2
I looked at the following thread which says optional parameters can be created in 10.1.2 but doesn't tell how tro create it
How to create optional parameters in Discoverer
Thanks in Advance

Hi.
In the thread you quoted Michael Armstrong-Smith says that optional parameters can be created in Plus but not in Desktop and that's true.
So your question "how to create optional parameters in Discoverer desktop" is already answered in that thread.
Assume that it is a typo and you wanted to ask how to create optional parameters in Plus.
Then the answer is simple: Just uncheck the "Require users to enter a value" checkbox when creating new parameter.
Regards Jakub

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The following explanation gives clear picture of what is mean of check box and radio button with coding.....................
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 p2(10) TYPE c,
 p3(10) TYPE c.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME.
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 p5(10) TYPE c MODIF ID bl2,
 p6(10) TYPE c MODIF ID bl2.
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CODING :
tables : mkpf,mseg,ekko.
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 c as checkbox.
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write :/ p_werks,
 / s_ebeln.
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