Excel VBA to Work Across Workbooks - vba

Question

I am very new to VBA coding and don't have very good understanding of what I am doing to be honest. But here I go.
I am looking to see if:
Can VBA codes have dyname values? So instead of the code saying execute on a set sheet (e.g "Sheet1") that value changes depending a value in a certain cell.
To trigger a VBA on another workbook. For example I want to run a VBA from Workbook A that triggers a VBA on Workbook B.
To fully explain I want to open Workbook A (and Workbook B if needed, it doesn't matter) and click a button that runs a VBA on Workbook B but on a certain Sheet depending on the value of a cell in Excel A (if the cell says "sheet3" the VBA runs on "sheet3" on Workbook B). I also want cells in Workbook A to reference cells in Workbook B but the the sheet name to by dynamic. For example I have pasted the basic cell reference bellow but instead of having Sheet1 I want it to change depending on the value in a cell.
='[Workbook B.xlsx]Sheet1'!$A$4
I know this sounds very complicates and confusing, but if I could get any help that would be greatly appreciated.
Sub ReportStepOne()
Dim myRow As Long
myRow = 4
Rows(myRow).Value = Rows(myRow).Value
Dim rng As Range
Set rng = Range("A4:AC200")
rng.Cut rng.Offset(1, 0)
Range("A1:AC1").Copy Range("A4:AC4")
End Sub
I want to:
edit this code to make it fire on a certain sheet
make it so the sheet name is referenced to whatever is in cell A o Sheet2 in Report.xlsm.
Run a macro in Report.xlsm that runs the above script (which is called "StepOne" in a file called "Historical Data.xlsm"

Answer 1

The code below takes the value of cell A4 on sheet2 in Reports.xlsm and sets the ws variable to the sheet in Historical data.xlsm which is then used for the rest of the code. If possible I'd advise against having your subs spread out over multiple projects but that is just my opinion. I think it is easier to use proper referencing like below.
Since you want a button trigger on the Report.xlsm I'd suggest moving this code to that workbook. If properly referenced it you can open, edit, save and close any workbook from a single project which again, in my opinion is easier than calling subs in a different project.
Sub ReportStepOne()
Dim wbHis As Workbook, wbRep As Workbook
Dim strWsName As String
Dim ws As Worksheet
Set wbHis = Workbooks("Historical data.xlsm")
Set wbRep = Workbooks("Reports.xlsm")
strWsName = wbRep.Worksheets("Sheet2").Cells(4, 1)
Set ws = wbHis.Worksheets(strWsName)
With ws
With .Rows(4)
.Value = .Value
End With
With .Range("A4:AC200")
.Cut .Offset(1, 0)
End With
.Range("A1:AC1").Copy .Range("A4:AC4")
End With
End Sub

Answer 2

To trigger a VBA on another workbook
Option Explicit
Sub RunVBA()
Dim xlApp As Excel.Application
Dim xlWorkBook As Workbook
Set xlApp = New Excel.Application
Set xlWorkBook = xlApp.Workbooks.Open("C:\Users\Om3r\Desktop\Book1.xlsm")
xlApp.Visible = True
xlWorkBook.Application.Run "Module1.SubName" ' Modulename.Subname
End Sub
To reference worksheet use
Sub CopyRange()
'// From sheet1 to sheet2
Worksheets(2).Range("A1").Value = Worksheets(1).Range("A1").Value
End Sub