How to add another table to publisher and subscriber without reinitializing the subscriber?
There is always 70% of answer in every question, I did research Sql Server Books Online and found the solution:

After a publication is created, it is possible to add and drop
articles. Articles can be added at any time, but the actions required
for dropping articles depend on the type of replication and when the
article is dropped.
Adding Articles   Adding an article involves:
adding the article to the publication; creating a new snapshot for the
publication; synchronizing the subscription to apply the schema and
data for the new article