adding fields from different records

I am building a data base and in it I have built a record where yI enter job numbers and P.O.'s. I would like to build another record where it will calculate all the amounts I have entered for any given PO. There may be 10 or twenty enteries for the same PO.

thanx

 

What are the field names in your table?

Make a query to contain the necessary fields.
In design view, hit View-Totals.
In the PO column, choose the group by dropdown and choose First.
In the PO Amount column, choose the Group by dropdown and choose Sum.

 

I tried this, but now I can't see my form unless I am in design view.

 

What happens? Why can't you see your form? It won't open? Likely, you need to create a new form based on the query...

Please give as much information as you can. There's any number of reasons someone "can't see my form".