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How do I do sampling on a specific subset of my dataset?

A customer asked about this in April 2017 - The customer has a 45 million row dataset and she wants to sample the dataset but she only wants to sample the data where Column Name = "Value"

To do this, first create a new dataset which is a subset of the 45 million row dataset and then perform the sampling.

Step 1: Use a Filtergram and select the desired values by which the dataset needs to be sampled. For Example: I want to select all the data where HQ STATE = CA.

Step 2: Create and publish a Lens that stores this view of the dataset for reusability.

Step 3:  Once this dataset has been created, bring it into a new Paxata Project and use the Sampling tool.

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