Menu -> Developer -> View Code
to edit code.
From the code, you task will depend on the extent of what you are looking to achieve.
If you are just looking to prevent DDE price updating, making your sheet lighter:
Then from Workbook_Open method, comment out "AddDDE" call. The updates will not be triggered.
If you are looking to remove ASK BID LAST columns from the sheet completely:
Then after you remove the columns, the remaining columns will shift, and you will need to update every reference within sheet code to the new valid coordinates, shifting by the removed columns, in your case it may be by 3, for example every "D" will become "A" while every "L" will become "I".
I am sending and canceling orders via excel VBA and Redi on 150 stocks. Redi crashes after a certain period of time, I will often get this response "Microsoft Excel is waiting for another application to complete an OLE action."