Making a cell appear blank

as you can see, this sheet displays #N/A in cells that are waiting for input... I would like them to be blank until I enter the input info that would then display values into these cells... I tried this in cell m7 BUT as you can see in m12 it goes back to displaying the N/A.

I would like for cells k,l,m 7 to display blank until I enter the info into cell d,e,f,or g 7.

Hope I am making myself clear.

I had asked in a previous question and thought I had it resolved but it is still happening.

Thanx in advance

-=Fred=-