Alias block

Use an alias block to assign a local name to a provided input. The input is typically a catalog entity, such as a dataset or property, but it can also be a block, value, or parameter. 

Use the Input field to configure the block. Specify the property to which you want to assign an alias. This can be an existing property of a dataset, such as a column or derived column, or it can be a block, value, or parameter.

To assign an alias to the Categories dataset,

The output of the alias block is identical to the input property you use.