You have 2 basic options, open YOUR ccf - the one that contains the bulk of what your creating. With your ccf open, open the new one and select merge. You can then delete what you don't want from the merged ccfs.
Second, open the new ccf and delete the unnessessary items, then save it (use different name) and close. Then open YOUR ccf and repeat as above.
You always want to merge into your ccf.
Deleting things can create problems. If you delete things that have codes that were aliased (or jumped to) in parts of the ccf that you keep, the buttons will show up blank.
Hope that helps,
Jim L