Newbie question on relative clause

[mrlocom]

The following sentence:

"The manual that I bought this morning will probably help."


Is it the whole sentence "The manual that I bought this morning will probably help." is called the relative clause,

or only the part "that I bought this morning" is the relative clause ?

[Harry Smith]

The following sentence:

"The manual that I bought this morning will probably help."


Is it the whole sentence "The manual that I bought this morning will probably help." is called the relative clause,

or only the part "that I bought this morning" is the relative clause ?

The relative clause is:"that I bought this morning" and the principle clause is:"The manuel will probably help."