How do you say "if so" in German?
Do you have some time? If so, I would like to speak with you.
Would you say "wenn ja"?
Haben Sie etwas Zeit? Wenn ja, ich möchte mit Ihnen sprechen.
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Yes I would use "Wenn ja," , but if you use this you need to invert the structure of the following sentence, due to the implied "dann":
Wenn ja, [dann] möchte ich mit Ihnen sprechen.
Alternatively you could also say: "Falls ja", "In dem Falle"
a little discurteous: "Dann" because this implies you expect the one you asked to have time
As suggested by @Toscho and @Dustin:
And as a more polite Alternative:
Falls sie Zeit haben, [dann] möchte ich mit Ihnen [über Thema xy] sprechen.