CTRL C two cells in sheet

go to Slide, with no field selected.

CTL V

The inserted box will have two cells instead of 1.

Upper right dropdown, EDIT LINK.

 

Chop off the second cell

 

 

https://support.google.com/docs/thread/10699568/how-link-individual-cells-in-sheets-to-presentation-in-slides-no-table-not-chart-just-one-cell?hl=en