A more complicated solver scenario, I think?

[NArawna]

Hi, I just watched the solver video which gives a basic introduction on how to use it and I would like some advice is solver can perform in the following scenario

1. Each year 25 customers are distributed between the 5 staff members based on a workload ability
2. Next the staff pick and equal or greater number of customers who they feel their skill set will help as a backup, As there are a greater number of Backup choices there will be some overlap.
3. Finally the staff are allocated their backup customers ensuring they meet at least their workload ability quota,

Here's a sample set of data for part 1.

	Staff					Customers
Name	Workload				Name	Primary Support	Backup
Bennie	5				Ada	Gita
Marchelle	3				Awilda	Marchelle
Gita	7				Beula	Gita
Albert	4				Brenna	Bennie
Cecil	6				Delora	Bennie
					Elisha	Albert
					Esta	Marchelle
					Janis	Albert
					Jann	Gita
					Julissa	Cecil
					Kareem	Cecil
					Lacy	Gita
					Maida	Gita
					Marta	Cecil
					Nadene	Bennie
					Nanci	Cecil
					Precious	Albert
					Rebbeca	Cecil
					Rene	Gita
					Roy	Albert
					Sherie	Cecil
					Soo	Bennie
					Soraya	Gita
					Suzi	Marchelle
					Wilmer	Bennie

<tbody>
</tbody>

And here is a sample set of data for the staffs choices as backup

Bennie	Ada	Elisha	Janis	Kareem	Lacy	Nanci
Marchelle	Beula	Brenna	Delora	Julissa	Maida	Precious	Rene	Soo	Suzi
Gita	Ada	Delora	Esta	Julissa	Marta	Nadene	Roy	Soo
Albert	Awilda	Esta	Jann	Julissa	Maida	Nadene	Rebbeca	Sherie	Wilmer
Cecil	Beula	Elisha	Esta	Lacy	Nadene	Precious	Rene	Soraya

<tbody>
</tbody>

As you can see each staff member has picked, at least, or more than, their current workload figures. I now need to distribute each staff member as the backup making sure that they do not conflict with the primary support and everyone gets a single backup.

I hope I have explained the question correctly and please feel free to give me some pointers on how I can achieve this.