It will be hard to keep track if you allow editing to go on in both the Master and Sub catalogs.
Why is it so is there any danger of loosing the edits.
MY work flow is simple as follows.
1. Import the shoot in master catalog
2. do selection & star rating & basic metadata
3. export the new shoot as its own catalog keep in the sub folder on the hdd
4. Now open the new exported catalog & do all the fine editing & tweaking
5. send proofs to client
6. convert final images as per the job requirement
7. once the job is printed & overall finished I sync the catalog with master catalog to show the same images in master catalog for later reference.
8. I then burn the images & the catalog on DVD (some would require multiple dvds)
just as precaution I will always sync the master catalog to sub catalog (Is there any danger in that?)
I followed your suggestion & see the catalog import dialog which ask for
replace> nothing
replace> metadata & develop settings only
replace> metadata, develop settings & negative.
In my case I should choose the 2nd option since I am not moving the negative files on the disk, i have only changed the develop settings in the individual catalog.
Is that right?