User Defined functions allow you to link multiple Standard functions together. For example, you could get the current date in one step, and change the format in a second step. Once created, they can be reused just like Standard functions.
Open your map, and click the plus sign next to Functions
Click "Create New Map Function" at the Add Function dialog.
Enter a name for your function.
Click the Plus sign next to "Steps" to add a new step
Pick a Category and function type and click OK.
Configure the defaults. This dialog will look different depending on which function type you chose.
Repeat steps 4-6 for any additional steps.
Add inputs by clicking the green plus sign next to Inputs. Do the same for outputs. Now drag-and-drop to link everything up. The example below shows a 2-step function. Note how the inputs are linked to step 1, step 1 is linked to step2, and step2 is linked to outputs.
Save your Function. Back in your map, you'll see the new function. You'll need to drag and drop fields from your source profile into your functions inputs. Then drag and drop fields from your function outputs to your destination profile.
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next to "Steps" to add a new step
