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I have a sharepoint list that has a number column call xyz i am creating a sharepoint designer workflow for that list in which i want to use update this list item action

if we chose actions as update this list item then chose the list as current item then chose set this field -> xyz to this value -> { how can i select here current value of xyz - 1 } i.e a variable formula

+1  A: 

Do it in two steps. First, declare a workflow variable (I'll call it "sample" here). Then, add a workflow step "do calculation" and set sample to xyz-1. The text line Designer shows you will look like Calculate <workflow name>:xyz minus 1 (Output to variable: sample afterwards.

Then, set the xyz value to current value of sample.

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