In ST7 and before you would have to model the bead in ASM using protrusion, label it as a bead and then pattern it etc. These would not appear in the parts list and you won't be able to get a count or reuse them in other ASMs.
New for ST8 you can create a part file with your favorite "Spot" geometry. Label it with the symbol you want. Label weld is in ordered mode. (You could have as many Spot parts as you have different spot welds)
Now you can place this weld as many times as you want in any ASM you need.
Use ASM pattern along curve for example to pattern the bead along edges. (Or any other placement method)
The # of spots and bead label callout will appear in draft using weld symbol tie to geometry option.
Hope this helps.
HINT: ALL bead types can be modelled and labled this way. Even complex beads. Place the bead part in your ASM. Replace with Copy and Morph it to fit (If it is Sync I like to use replace face for these so they match the target parts.)