Mario,

You could use a userform to allow a user to enter numbers into a text
box that are then summed with the sum placed into the cell. Would
that work?

Otherwise, just have the user start type

=100+20-15-10

and Excel will evaluate the formula that results to show 95.

HTH,
Bernie
MS Excel MVP

"Mario" wrote in message
y.telekom.at...
hmm
the perfect solution would be that if u do doubble click on B3 a
"new-small-tiny-excel" opens and that u can type in there
A
1 100
2 20
3 -10
4 -15

and that B3 than has the vaule 95
the problem is that tere could be 20-30 of these B-fields so a
connection to
another table is tooo complicate
u understand the problem?

kind regards
mario