You can filter your analyses to specific segments of your data.  For example, in the Titanic demo you may want to filter an analysis to only include riders who were "Female".  To do so, just click on the "Filters" button in the top right corner of the card, and create a filter like:

Similary, for a number like "Age", you can create a range filter like "Age is between 20 and 40":

You can then save these filters and use your previously saved filters, to quickly perform analyses on specific segments of your data by clicking "Save filter" and then using a particular saved filters for new analyses by selecting one from the global list like:

Or by choosing a saved filter from the analysis card, like:

Applying a Filters to a Workspace

To quickly apply filters to an entire workspace, pick a saved filter, and then click the apply to current workspace button, as seen below: