How do I pull global CSS into .vc_custom_...?

Hello We are using VC WPBakery through the HighEnd theme and have a unique situation where we’ve had to setup 80+ pages with very customized Row-Settings that are liable to change later on, as the customer gets more modern content.

WP Bakery seems to be pulling this data from a nested section like this: [vc_row][vc_column][vc_row_inner equal_height=“yes” content_placement=“top” css=".vc_custom_15…

How can I take that .vc_custom {} and make it globally-changable from the master CSS page??

Does this require Custom PHP modification??

Thanks So Much!