Count column formula

Hi,

I hope this is the right forum.

we have an internal projectnumber which is created from different columns, for example: If column D = "X" then column E = 100 else 1000. Furthermore we count a string and increase the number, for example: string "abc" count 5, our new project has to get a 6. We already have a formula in excel which count given string.

I want to know if we can do it in project prof? I think that we have to use user defined fields with calculations but I did not find a count or countIf. Or can it be done with linking our excel column to a new project column? 

Thanks for any input!