|Do you mean you want to change only the width/height of A2-|
Changing the height of those cells, will change the height of
the Rows. (Row2-Row8)
Changing the width of any cell in the A2-A8 range, will also
change the width of the entire ColumnA.
Cells are not separate entities in Excel.
They are part of Rows and Columns.
Modifying dimensions of cells, will affect the relevant
Rows/Columns as well.