As it is now, you have to move the components from your bag to your stash, then use the combine all components button. How about a single button that can combine the components in your inventory bag with the components in your stash without having to move them?
There’s already a button in the inventory that combines component parts into whole ones if you have enough parts to do it. Then just hold down the left-shift key while left clicking on components in your inventory and they’ll move into your stash area ready to be combined with whatever ones you already have there by using the combine button in the stash.
This has already been asked in several posts. Hopefully, it will be included into the QoL list of the next expansion.