Originally Posted by 4A2B

This is not accurate, when you have a vacation and a reserve line, you will have an equal number of R days removed for each Vacation Day. If you "extend" you are increasing the number of actual vacation days. The vacation days and buffer are there to protect your vacation footprint. Reserve line reconstruction can be done for removing r days OR moving r days that are in excess of the number you can remove with vacation, but are within the buffer(s) or v day footprint.

From section 7:

b. A reserve line holder’s vacation credit hour bank shall be
reduced by the R-day value for each day of vacation in the
bid period.

There is no provision to only be "charged" hours for the days in conflict with the buffer or vacation footprint. It will always be a 1 for 1 transaction, line rebuilding does include "requests" for either selected days to be removed or where to relocate days that need to be moved from the footprint.

example: 8 days of vacation with 4 buffer days, happens to "cover" 12 r days. Bank reduced by 8 * r day value and 4 r days need to be moved outside of your footprint. You can "request" where those 4 days be located. In the reverse, if your 8 days and buffers touch NO r days, you still are charged 8 * r day value and then you can "request" which 8 r days outside of the footprint are removed, the only hitch here is that scheduling must "retain" the most amount of "original" blocks from your awarded line as possible, if you had a blocks of 3,4 and 8 (assume, all outside of the footprint for ease) scheduling would be compelled to remove the block of 8 and not the 3,4 and 1 day from your 8.

At least that is the way I understand the process.