@Yatz86 Regarding the size of the column, it would be really small as there will be only 6 unique values. So it will have very minimal impact on the data stored in memory.
No, even if you had 10 Billion rows the size wouldn’t increase much as the dictionary size of 6 words is too small, you can try to create a column in the fact table and measure the size of the column with DAX Studio and the result would be surprising. Do try it.