Merge two columns into one column, one cell after another - excel

Question

I am trying to merge two columns into one column, one cell after another. For example, I have start time in one column and End time into another column, shown in pic. I am trying to merge them into one column (Time) that has start time in one cell and end time in the cell just below it, with duplicating the code (the third column) with each addition. Like shown in the pic.
Is there a way to do that?

Answer 1

Forwards:
Formula in D2:
=INDEX($A$2:$B$9,ROUND(ROW(A1)/2,0),MOD(ROW(),2)+1)
Formula in E2:
=INDEX($C$2:$C$9,ROUND(ROW(A1)/2,0))
Backwards:
Formula in D2:
=INDEX($A$2:$B$9,ROUND(((COUNTA(C:C)-1)*2-(ROW(A1)-1))/2,0),MOD(ROW(A1),2)+1)
Formula in E2:
=INDEX($C$2:$C$9,ROUND(((COUNTA(C:C)-1)*2-(ROW(A1)-1))/2,0))

Answer 2

This is the forumula I would use:
=CHOOSE(SEQUENCE(,2),INDEX(A1:B8,(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0)-MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8)))/COLUMNS(A1:B8)+1,MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8))+1),INDEX(C1:C8,(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0)-MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8)))/COLUMNS(A1:B8)+1))
But that formula is a bit messy, so, I wrote another one that breaks down the formula in a way that I can talk through how it works and what its doing:
=LET(
TimeRange,A1:B8,
CodeRange,C1:C8,
RowCount,ROWS(TimeRange),
ColumnCount,COLUMNS(TimeRange),
CellCount,RowCount*ColumnCount,
BaseSequence,SEQUENCE(CellCount,,0),
ModSequence,MOD(BaseSequence,ColumnCount),
RowIndex,(BaseSequence-ModSequence)/ColumnCount+1,
ColumnIndex,ModSequence+1,
Result1,
INDEX(TimeRange,RowIndex,ColumnIndex),
Result2,
INDEX(CodeRange,RowIndex),
CHOOSE(SEQUENCE(,2),Result1,Result2)
)
If you want to paste this formula into your spreadsheet, just make sure that you have the formula bar selected. If you don't, Excel will paste the text so that each line break moves to the next row.
What does each part do? This table steps through each parameter, and explains what each one does. And yes, when using a LET statement, you can use variable names declared in the prior step, but you can't do it the other way!
Part
Explanation
LET(
LET basically allows us to name our own variables. You'll see what I mean in the following sections
TimeRange, B11#
This is the StartTime and EndTime Ranges from your example
CodeRange, D11#
This is the Code range from your example
RowCount, ROWS(TimeRange)
This gives us the number of rows in TimeRange, and stores it as RowCount
ColumnCount, COLUMNS(TimeRange)
This gives us the number of columns in TimeRange, and stores it as RowCount
CellCount, RowCount*ColumnCount
This calculates how many cells there are. Note that our answer will have rows equal to CellCount
BaseSequence, SEQUENCE(CellCount,,0)
This creates a sequence of numbers, arranged in a single column, starting at 0, and stores the result in BaseSequence
ModSequence, MOD(BaseSequence, ColumnCount)
Here, we take the MOD of BaseSequence, by ColumnCount. Why? Because this effectively gives us a list of numbers counting up from 0 to 1. Note that this is why BaseSequence had to start at 0
RowIndex, (BaseSequence - ModSequence)/ColumnCount + 1
This basically counts through the rows, giving us 1, 1, 2, 2, 3, 3, (etc)
ColumnIndex, ModSequence + 1
Because unlike MOD, which starts at 0, column and row indices start at 1
Result1, INDEX(TimeRange, RowIndex, ColumnIndex)
This is our left hand column, and basically picks through the TimeRange, going through each row by picking up each column first
Result2, INDEX(CodeRange, RowIndex)
This is our right hand column, and it basically doubles up each element in the CodeRange (i.e. teacher, teacher, student, etc), because RowIndex runs 1, 1, 2, 2, 3…
CHOOSE(SEQUENCE(,2),Result1, Result2)
The last item in a LET statement is the one that returns a value to the spreadsheet. Here, I'm using a SEQUENCE to make a range 1 row and ColumnCount columns wide (i.e. [1, 2]). This goes into CHOOSE, which will select Result1 when it gets a 1, and Result2 when it gets a 2. Because both Result1 and Result2 are ranges, CHOOSE effectively combines them into a single Range
Also, in the event you want it, this is the formula I posted first (at the top), but with additional line breaks to improve legibility:
=CHOOSE(
SEQUENCE(,2),
INDEX(
A1:B8,
(
SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0)
-MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8))
)
/COLUMNS(A1:B8)+1,
MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8))+1
),
INDEX(
C1:C8,
(
SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0)
-MOD(SEQUENCE(ROWS(A1:B8)*COLUMNS(A1:B8),,0),COLUMNS(A1:B8))
)
/COLUMNS(A1:B8)+1
)
)

Answer 3

Assuming your data starts in row 2.
=A2&" "&B2