The "Treasure for New Characters" table (https://2e.aonprd.com/Rules.aspx?ID=587) lists the item levels a character can start with. For example, a character starting at 5th level could take a single 4th level item, 2 3rd level items, 1 2nd and two 1st.
If a player wants an item composed of multiple runes, does each rune count against the items limits specified above? For example, would a +1 striking weapon take 4th level item _and_ and 2nd level item slot?