Click on New Flow and select instant cloud flow and provide the trigger as Manually trigger a flow and click on Create as shown in the below figure.

Give the flow with name “UnionFunction” and create a parallel branch with a variable that is initialised and has values on one side.

the parallel branch’s opposite side takes another  initialised variable and inputs values.

according to the image above

under parallel branch take a compose action

use the expression in the input section as shown in below.

union(variables(‘Names’),variables(‘Vehicle’))

As shown in the below figure, save and test the flow to see the results.

In this way, we can use Union function in power automate to achieve customer functionality.

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