Code to search for matching values in two columns, take text from that row and copy

Okay, thanks

I've just made a little file to hopefully show what is needed.

things that the code needs to do:
1. Identify when Column B changes value, then insert two blank rows above and below
2. Identify matching values in Column B and C (Task_ID and Parent_task) because the same Task_ID and Parent_task is located in different places in the sheets.
3. insert "Begin" above the cell in the new blank row in Column C where the values changes
4. Insert "end" below the cell in column C where the value changes
5. Copy values from column D-F from matching row in column B
6. Paste matching values from Column D's into the same row as the new "begin" and "end" Rows.

Don't know if make sense ?

So main thing is the identify matching values from Parent_task and Task_ID and the insert two blank rows above and below where the values in Parent_task Column (Column C) changes, and copy the cells from matching column C (but only the columns D-F's cells in the same row as the matching value in column B is.