Add a line based on values VBA

Good day everyone,
I need help.. :-)
I have an excel form where requestor needs to select some values in a drop down list. If the value choosen is "Extend" or "Modify" a new line is created just below so requestor can add the product number that needs to be modified/extended.

Two problems i cannot solve :
1) when the line is added, the drop down list from above (the one requestor used to make his choice) is also created where i shuold have an empty cell where user will mention his product number.
2) further down in the same column, i have another cell where requestor needs to choose in the drop down list (F or E or X), based on the answer, a new line should be created below (without the drop down list from above of course)

this file is created as a table, but can be removed this is not an issue for me.

Attached you will find the file with explanations

Thank you for the help
Guismo30