1 - I would like a radio button with 2 options, single and not single, wich upon changing/updating would do the following :
if option = single then c4 = gastos!b20
if option= not single then c4 = gastos!c20
2 - and also the following :
after updating the cell J3
if the M column contains a cell with value < than gastos!g2 then
reduce in a loop the value of J3 (step -10) until
all the values in column M are greater than gastos!g2