What Do I Need to Change in My Script to Add Column A to Column B Returning the Answer in Column B E-CodePudding

I'm brand new to java & scripting in Google Sheets & this is my first question on here, so any etiquette tips are appreciated.

I have been learning so much from this site, but I've been stuck on this simple error for weeks now & finally just have to ask since I can't find a solution anywhere.

EDIT to Hopefully be More Clear

I have a sheet with pricing in column "U" with formulas in columns "V" & "W" that change according to the value in "U". I created a button & attached a script that I would like for it to add the value of each cell in V to the value in W of the same row, for one iteration each time I select the button, & returning the new values in the same cell of column W.

function sumColumns(){
  var spreadsheet = SpreadsheetApp.getActive();
  var currentRow = spreadsheet.getDataRange().getLastRow(); //Get the last row with value on your sheet data as a whole to only scan rows with values
  for(var x =2; x<=currentRow; x  ){ //Loop starts at row 2
    if(spreadsheet.getRange("V" x).getValue() == ""){ //Checks if V (row# or x) value is null
      Logger.log("Cell V" x " is empty"); //Logs the result for review
    }
    else{
      var res = spreadsheet.getRange("V" x).getValue()   spreadsheet.getRange("W" x).getValue(); //SUM of V & W values
        spreadsheet.getRange("W" x).setValue(res); //Replace W value with "res"
    }
  }
}