Easier way of Importing data into excel - collections? - arrays

Question

Is there an easier way of importing data into an excel array or other data structure? I've tried researching collections but I have found the documentation hard to comprehend.
http://www.functionx.com/vbaexcel/objects/Lesson6.htm
https://msdn.microsoft.com/en-us/library/f26wd2e5%28v=vs.100%29.aspx
The code I have below opens a select file and searches for the column header and then loops through each row storing the data according to header and row variables, I've done this method for many macros in the past but now I am dealing with many many columns and I'm looking for a more advanced way?
Sub Import_NAVRec()
MyPath = Range("b2") 'Defines cell that contains path to source file
Workbooks.Open (MyPath) 'Opens file
Set tempbook = ActiveWorkbook 'Names workbook
LR = Range("A65000").End(xlUp).Row 'finds last row in sourcefile
ReDim aNavRec(1 To LR, 1 To 4) 'Defines NAV Rec array
nRow = 0
cName = "Accounting Basis"
CA = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
cName = "Accounting Date"
cB = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
cName = "Asset Currency"
cC = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
For r = 2 To LR
'If Cells(r, cB) = "Trading Gain Loss" Then
nRow = nRow + 1
aNavRec(nRow, 1) = Cells(r, CA) 'Fund Number
aNavRec(nRow, 2) = Cells(r, cB) 'Ledger
aNavRec(nRow, 3) = Cells(r, cC) 'Balance change
'End If
Next r
tempbook.Close
End Sub
Sub Print_output()
Sheets("Output").Select
Set Destination = Range("a2")
Destination.Resize(UBound(aNavRec, 1) + 1, UBound(aNavRec, 2)).Value = aNavRec
End Sub

Answer 1

The only thing we can help you eliminate is the for loop in the middle of you code. The rest seems to be necessary.
Option Explicit
Sub Import_NAVRec()
Dim LR As Long
Dim MyPath As String
Dim aNavRec As Variant 'Defines NAV Rec array
Dim tempbook As Workbook
Dim CA As Long, cB As Long, cC As Long
MyPath = Range("B2") 'Defines cell that contains path to source file
Workbooks.Open (MyPath) 'Opens file
Set tempbook = ActiveWorkbook 'Names workbook
LR = Range("A65000").End(xlUp).Row 'finds last row in sourcefile
cName = "Accounting Basis"
CA = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
cName = "Accounting Date"
cB = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
cName = "Asset Currency"
cC = Cells.Find(What:=UCase(cName), After:=ActiveCell, LookIn:=xlFormulas, LookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext).Column
aNavRec = Application.Index(Range("A:AZ"), Application.Evaluate("Row(1:" & LR & ")"), Array(CA, cB, cC))
tempbook.Close
End Sub
With Option Explicit some more Dim were necessary (which I included in the above soluion).
Note: just found this solution here: use variable for row_num application.index