Hello Ddick,
to support multiple Vlans:
all switches define the Vlans as L2 broadcast domains
L3 switch provides L3 services for each vlan/subnet using logical SVI interfaces (in vlan x serves Vlan x)
each SVI needs
int vlan X
ip addr x.x.x.x y.y.y.y
no shut
links between L3 switch and L2 switches has to be L2 trunk carrying all needed vlans
Hope to help
Giuseppe