Variables can be used to store information such as download locations. To use a variable in Flow:
Define the variable in a code cell (for example, locA = "https://h2o-public-test-data.s3.amazonaws.com/bigdata/laptop/kdd2009/small-churn/kdd_train.csv").
Run the cell. H2O validates the variable.
Use the variable in another code cell (for example, importFiles [locA]).
To further simplify your workflow, you can save the cells containing the variables and definitions as clips.