BofA Customized Cash Back Question

Do I understand this correct that you can stack cash back(I'm ignoring the 3% bonus for the first year thing for the purposes of my question). For example, if I buy shop cards ONLINE at costco, do i get the 3% online shopping (assuming i chose that as my category)+ 2% wholesale club (as a BofA default).

Summary of rules:

3% cash back + 3% first-year cash back bonus on gas and EV charging station, online shopping/cable/streaming/internet/phone plan, dining, travel, drug store/pharmacy, or home improvement/furnishings purchases

2% cash back at grocery stores and wholesale clubs

1% cash back on all other purchases

Earn 6% and 2% cash back on the first $2,500 in combined purchases each quarter in the choice category and at grocery stores and wholesale clubs, then earn unlimited 1% thereafter. After the 3% first-year bonus offer ends, you will earn 3% and 2% cash back on these purchases up to the quarterly maximum.

No expiration on rewards, as long as the account remains open

To change your choice category for future purchases, you must go to Online Banking, or use the Mobile Banking app. You can change it once each calendar month, or make no change and it stays the same.