Write on the next available cell of a given column - vba

Question

I have a somewhat simple macro that I have made but I am rusty as I have not coded in a few years. As simply as I can put it, I Have two different Workbooks. If the workbook I have open has a certain value (or no value), I want it to fill the other workbook("Test Template") with either "proposal or pre-proposal."
That has all been easy for me. But since the worksheet adds rows as we input data, I need it to fill those values in the next available row.
I will attach code but don't worry about the proposal stuff, I just need the range changed from a specific cell into the next available cell in the column. (if d28 is full, put in d29).
Public Sub foo()
Dim x As Workbook
Dim y As Workbook
'## Open both workbooks first:
Set x = ActiveWorkbook
Set y = Workbooks.Open("C:\Users\hmaggio\Desktop\Test Template.xlsx")
'copy Names from x(active):
x.Sheets("Sheet1").Range("C4").Copy
'paste to y worksheet(template):
y.Sheets("Sheet1").Range("B28").PasteSpecial
If x.Sheets("Sheet1").Range("C15") = "" Then
y.Sheets("Sheet1").Range("D28").Value = "proposal"
Else
y.Sheets("Sheet1").Range("D28").Value = "preproposal"
End If

Answer 1

First, you need a variable where you'll store the last used row number:
dim lngRows as long
lngRows = Cells(Rows.Count, "D").End(xlUp).Row
Then replace your lines of code where you have .Range("B28") with either .Cells(lngRows+1,2) or .Range("B"&lngRows)

Answer 2

The object Range offers a method called End that returns the last range on a certain direction.
Range("A1").End(xlDown) '<-- returns the last non-empty range going down from cell A1
Range("A1").End(xlUp) '<-- same, but going up
Range("A1").End(xlToRight) '<-- same, but going right
Range("A2").End(xlToLeft) '<-- same, but going left
In your case, hence, you can detect and use the last row of column B like this:
nextRow = y.Sheets("Sheet1").Range("B3").End(xlDown).Row + 1
More details:
The first Range of your column B is the header Range("B3")
You get the last filled range going down with .End(xlDown)
Specifically, you get the Row of that range
You add + 1 (cause you want the next available row
You store the row in the variable nextRow
... that you can then use like this:
y.Sheets("Sheet1").Range("B" & nextRow ).PasteSpecial

Answer 3

Try this
Public Sub foo()
Dim x As Workbook
Dim y As Workbook
Dim fromWs As Worksheet
Dim toWs As Worksheet
Dim Target As Range
'## Open both workbooks first:
Set x = ActiveWorkbook
Set y = Workbooks.Open("C:\Users\hmaggio\Desktop\Test Template.xlsx")
Set fromWs = x.Sheets("Sheet1")
Set toWs = y.Sheets("Sheet1")
With fromWs
Set Target = toWs.Range("b" & Rows.Count).End(xlUp)(2) '<~~next row Column B cell
Target = .Range("c4") 'Column B
If .Range("c15") = "" Then
Target.Offset(, 2) = "proposal" 'Column D
Else
Target.Offset(, 2) = "preproposal"
End If
End With
End Sub