Good Morning,
I have an excel sheet I'm building that does budgeting for specific types of projects. I have most of the VBA worked out for that. The part I'm having issues with is updating an exteral excel tracker.
This is the script to create the tracker if it doesn't exist:

Sub trackerTest()
Application.DisplayAlerts = False
Application.ScreenUpdating = False
Set objWS = CreateObject("WScript.Shell")
strDesktopPath = objWS.SpecialFolders("Desktop")
Workbooks.Open Filename:=strDesktopPath & "\sites\Tracker.xlsx"
Application.DisplayAlerts = True
Application.ScreenUpdating = True
End Sub

The main sheet I'm working on will have a dynamic name based on properties within the sheet. IE Job Number, Site Name, etc
This is a snippet from that save code (no issues with this):
ActiveWorkbook.SaveCopyAs Filename:= _
strDesktopPath & "\sites\BU# " & BUN & " JOB# " & JDE & " " & STE & "\BU# " & BUN & " JOB# " & JDE & " " & STE & " Main.xlsm"

The Tracker will have a line for each Job/Contractor and will look similar to this (ignore the strikethrough)

111111 222222 SX33333 RF MOD YYYYY $3,398.90 2-May 3-May
111111 222222 SX3333 RF MOD XXXXX $3,697.09 4-Aug 4-Aug

What I need is in my main sheet (which has the dynamic name above) able to edit the lines on the tracker. I don't need it to delete lines but I need it able to differentiate based on the Contractor/ Job number/ Amount ---
I have three buttons on my main sheet. Tracker POR Sent, Tracker - Budget Out, and Tracker - PO Sent
So when I click one it goes to the tracker sheet (That was created if it wasn't there already), and either update an existing tracker line based on its search or adds a new tracker line if it isn't there yet. Then updates a section of the tracker based on the button - a Date in the POR sent, Budget out, or PO Sent section

Below is the code I'm experimenting with to find the lines on the tracker - It works in theory but when I put variables in noted sections it doesn't work anymore

Sub linesearch()
Set objWS = CreateObject("WScript.Shell")
strDesktopPath = objWS.SpecialFolders("Desktop")
Workbooks.Open Filename:=strDesktopPath & "\sites\Tracker.xlsx"
Dim rngFound As Range
Dim strFirst As String
Dim Joba As String
Joba = ThisWorkbook.Sheets("Project Selection").Range("C5").Value
Dim amnta As String
amnta = ThisWorkbook.Sheets("Project Selection").Range("C11").Value
Set rngFound = Columns("A").Find(BU, Cells(Rows.Count, "A"), xlValues, xlWhole)
If Not rngFound Is Nothing Then
strFirst = rngFound.Address
If LCase(Cells(rngFound.Row, "B").Text) = LCase(Joba) And _
LCase(Cells(rngFound.Row, "F").Text) = LCase(amnta) _ **********This Joba and amnta are names in the main worksheet to determine if tracker has viable line - This whole sub works when I have specific text in this section but not named items??*****
'Found a match
MsgBox "Found a match at: " & rngFound.Row & Chr(10) & _
"Value in column C: " & Cells(rngFound.Row, "C").Text & Chr(10) & _
"Value in column D: " & Cells(rngFound.Row, "D").Text
End If
Set rngFound = Columns("A").Find(BU, rngFound, xlValues, xlWhole)
Loop While rngFound.Address <> strFirst
End If
Set rngFound = Nothing
End Sub

Now, This was pilfered from an online source so I get the basics of what it is doing but not the whole understanding.

My biggest issue is when using the main sheet (dynamic name) - Going into the tracker and finding the line I need or creating it - then coming back to the main sheet
I don't really know how to do that

So my questions:
When I switch the active sheet to tracker.xlsx how do I go back to the dynamic name sheet?
What is the best way to update the tracker lines? I'm fairly confident I can find the row number with the above script if I get it working with the named items (amnta, joba) which correspond with a cell on the main sheet.
I want it to be able to add lines to the tracker if they don't exist - and it has a variable number of lines (can add them in the beginning)

Any help would be appreciated!