You can create aliases for the members of a dimension by right-clicking the dimension in the Data pane or in the view and selecting Aliases. This changes how the values are displayed in the view, but not the underlying data. For example, you can create an alias for "Central" as "Midwest".
In Tableau, aliases can be used to change the way dimension members appear without altering the underlying data. This is useful for display purposes and does not create a new field within the dataset.

check the steps below in explanation.
Explanation:
To filter the table to show the members of the Top10 set and the Bottom10 set, you need to do the following steps:
* Open the link to Book1 found on the desktop. This will open the Tableau workbook that contains the Disciplines worksheet.
* Click on the Disciplines tab at the bottom of the workbook to open the worksheet. You will see a table that shows the disciplines, sales, and profit for each salesperson.
* Click on the drop-down arrow next to Salesperson on the Filters shelf. This will open a menu that allows you to filter by different criteria.
* Select Set from the menu. This will show you the sets that are available for the Salesperson field. You will see Top10 and Bottom10 as two sets that have been created based on the sales ranking.
* Check the boxes next to Top10 and Bottom10. This will filter the table to show only the members of these two sets. You can also click on All to deselect all other values.
* Click OK to apply the filter. You will see that the table now shows 20 rows, 10 for each set.
References: https://help.tableau.com/current/pro/desktop/en-us/sets.htm https://help.tableau.com/current/pro/desktop/en-us/filtering.htm

check the steps below in explanation.
Explanation:
To modify the chart to show only min and max values of both measures in each region, you need to do the following steps:
* Open the link to Book1 found on the desktop. This will open the Tableau workbook that contains the Line worksheet.
* Click on the Line tab at the bottom of the workbook to open the worksheet. You will see a line chart that shows the sales and profit for each month by region.
* Drag Month from the Columns shelf to Filters shelf. This will open a dialog box that allows you to filter by different criteria.
* Select Range of Dates from the dialog box. This will show you options to filter by a range of dates or values.
* Select Minimum and Maximum from the drop-down list next to Month. This will filter by the minimum and maximum values of Month for each region. You can also enter specific values or use the sliders to adjust the range.
* Click OK to apply the filter. You will see that the line chart now shows only min and max values of both measures in each region.
References: https://help.tableau.com/current/pro/desktop/en-us/filtering.htm https://help.tableau.com/current/pro/desktop/en-us/filtering_range.htm