You can complete several bulk updates from the UI.

To do this please go to inventory-> inventory & listings -> bulk updates.

From here you have 3 options, bulk edit, bulk quantity update, and bulk price update.

When you select the option 'bulk edit' the below window will appear, from here you can select the field you would like to bulk edit.

Once selected the below page will appear, from here you can search for the products you wish to update, bulk select and enter the new value you want to replace.

In the example below I have chosen to update the title field, and have been given the option to either replace the title entirely, append or prepend, the new value text, to update the title field.

When you select 'bulk quantity update' the below page will appear, from here you can enter the new quantity for your SKU's.

(Please note, before updating the quantity field you need to select the products from the main inventory page that you wish to update)

When you select 'bulk price update' the below page will appear, from here you can enter the new price for your SKU's

(Please note, before updating the price field you need to select the products from the main inventory page that you wish to update)