I am setting up data for my website and this is what I need to do:

I have 12,000 lines of product names in column A. Column B contains the product model number. I need to combine each product with the model number and add a a space and dash (-) between the product name and model number. see example below:

A: Fishfinder
Life Vest

B: 1234.01
L1245K

Here is how I need it to appear in column A: but for 12,000 lines so cant do it manually.
A:
Fishfinder - 1234.01
Life Vest - L1245K

Thanks for your help!