To set the fiscal year start month for a data source, follow these steps:
- Right-click (Control-click on Mac) the data source in the Data pane to open the Date Properties dialog box.
- Set the Fiscal year start field to the appropriate month.
For each date dimension, you set the fiscal year start-month separately. In the Data pane, right-click a date dimension (Ctrl-click on Mac), and select Default Properties > Fiscal Year Start.
Refer ---->Fiscal Dates - Tableau
Hope it helps! If yes, please mark the answer
Did you know that you can select multiple filters choices in Tableau like you can in Excel? So by holding shift you can select all options in between.
I think Ritesh answers your second part of the questions quite well.