Breaking Up And Dividing Bromeliads
When dividing, your plants must be at the right size to survive
Your baby plants (pup's) need to be 1/3 the size of the mother plant. You need to be careful not to snap the bottom of the pup off you do not need roots like other plants but you do need the heel as per picture below, no heel no plant as a general rule.
once pup's have been removed you can plant them just like any other plant but you may need 3 stakes to hold the bigger plants upright as when they fill with water they will topple, also do not bury the pup in the pot only plant to the heel any higher may cause the heel to rot
add some 6 month slow release fertilizer (any fertilizer as it is only to help develop roots and being a slow release it is not going to be a problem. large/long term amounts of fertilizer may not be good as can remove colours from leaves and soften the plant if in a garden environment.
Happy Growing