In some elements, in the Function Tree section, we see functions such as 9001 which are grey and sub-functions such as 4001 which are green.

My question is as follows: How can we make 9001 take on the colour of one of the sub-functions? (We'd like it if, for example, 4001 was green, 9001 would also be green. If it turns orange, we'd like it to turn orange).