sql server - Better use of redundant subquery in sql- case -

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i have question sql- statements: possible "define sub query" multiple use in case. sounds bit confusing following example think clear have in mind:

select   column1,  column2,  case     when <bigsubquery> > 0 <bigsubquery>     else 0  end ...

how can this, or can use. have such query works wonderful, huge code , not useable maintenance.

if using subquery, should put condition in subquery. instance, if have:

(select sum(x) . . . )

then do:

(select (case when sum(x) > 0 sum(x) else 0 end) . . .

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