Any null values will show as blank cells in the final Excel table. If you'd prefer to fix this within the Power Query Editor, ...
Nest CHOOSECOLS inside UNIQUE to extract non-adjacent columns, and use INDIRECT for interactive header dropdowns.
Create a report using charts: Select Insert > Recommended Charts, then choose the one you want to add to the report sheet. Create a report with pivot tables: Select Insert > PivotTable. Select the ...