English to Spanish Bus/Financial Management Company mergers

Dear colleagues,

This is part of a presentation of a merger that has recently taken place. The company that acquired part of another company is now talking about the integration process. The term STAND-UP is an enigma to me in this context. Any ideas?

The sentence reads:
"Over the course of the months following the merger we have successfully engaged in many activities to stand-up and integrate the legacy businesses"

My attempt:

"Durante los meses posteriores a la fusión hemos llevado a cabo exitosamente muchas actividades para ............ e integrar los negocios heredados"


Thanks in advance!