I think you need to read a dataTable from excel and then outside the excel application scope you apply the remove data row on the retrieved dataTable and then you write the resulting dataTable to a new excel (or even replace the old one with the new one using the same path)
hello @Lawrance_A
can u try with select query using data table , filter dat data and write in excel
dt=dt1.select(“[Column1]” != ‘na’ ").copytodatatble() write in assign activity