A corporation can issue new shares.
the proceeds are going into the corporation cash.
there are two places where you can sell corporation shares:
1 on the share market - the seller is the owner (country or enterprise).
2. On the corporation page. the seller is the corporation.
In public corporations, also in the real world, one shareholder, even if he holds 90% of the shares, cannot move money in or out of the corporation.
if you want an investment into the corporation, ALL shareholder must participate, paying or receiving the same amount per share.
In the real world, share holder can decide to purchase some new shares or not. If they do, their percentage can remain the same as before, if not, their share is diluted.
This is hard to do here, forcing all shareholders to decide what they want to do.
hence the issuance of new shares by the corporation on the market and anyone can participate.
You can issue the shares and then purchase them by your country or enterprise.